BindingDB Reactant_set_id	Ligand SMILES	Ligand InChI	Ligand InChI Key	BindingDB MonomerID	BindingDB Ligand Name	Target Name	Target Source Organism According to Curator or DataSource	Ki (nM)	IC50 (nM)	Kd (nM)	EC50 (nM)	kon (M-1-s-1)	koff (s-1)	pH	Temp (C)	Curation/DataSource	Article DOI	BindingDB Entry DOI	PMID	PubChem AID	Patent Number	Authors	Institution	Link to Ligand in BindingDB	Link to Target in BindingDB	Link to Ligand-Target Pair in BindingDB	Ligand HET ID in PDB	PDB ID(s) for Ligand-Target Complex	PubChem CID of Ligand	PubChem SID of Ligand	ChEBI ID of Ligand	ChEMBL ID of Ligand	DrugBank ID of Ligand	IUPHAR_GRAC ID of Ligand	KEGG ID of Ligand	ZINC ID of Ligand	Number of Protein Chains in Target (>1 implies a multichain complex)	BindingDB Target Chain Sequence	PDB ID(s) of Target Chain	UniProt (SwissProt) Recommended Name of Target Chain	UniProt (SwissProt) Entry Name of Target Chain	UniProt (SwissProt) Primary ID of Target Chain	UniProt (SwissProt) Secondary ID(s) of Target Chain	UniProt (SwissProt) Alternative ID(s) of Target Chain	UniProt (TrEMBL) Submitted Name of Target Chain	UniProt (TrEMBL) Entry Name of Target Chain	UniProt (TrEMBL) Primary ID of Target Chain	UniProt (TrEMBL) Secondary ID(s) of Target Chain	UniProt (TrEMBL) Alternative ID(s) of Target Chain
50221470	CCCCCCCCCCCCCCCC(=O)N[C@@H](CC(F)(F)P(O)(O)=O)[C@H](O)c1ccccc1	InChI=1S/C26H44F2NO5P/c1-2-3-4-5-6-7-8-9-10-11-12-13-17-20-24(30)29-23(21-26(27,28)35(32,33)34)25(31)22-18-15-14-16-19-22/h14-16,18-19,23,25,31H,2-13,17,20-21H2,1H3,(H,29,30)(H2,32,33,34)/t23-,25+/m0/s1	KQPGDBVGEXAZAW-UKILVPOCSA-N	50122309	((3S,4R)-1,1-Difluoro-3-hexadecanoylamino-4-hydroxy-4-phenyl-butyl)-phosphonic acid::CHEMBL310981	Sphingomyelin phosphodiesterase [1-45,48-631]	Homo sapiens		 49000							ChEMBL	10.1016/s0960-894x(02)00888-0	10.7270/Q2K64HFH	12482429			Yokomatsu, T; Murano, T; Akiyama, T; Koizumi, J; Shibuya, S; Tsuji, Y; Soeda, S; Shimeno, H	Tokyo University of Pharmacy & Life Science	http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50122309	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=pol&polymerid=50001580&target=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=r21&monomerid=50122309&enzyme=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search			44315263	104015001		CHEMBL310981				ZINC43815396	1	MPRYGASLRQSCPRSGREQGQDGTAGAPGLLWMGLVLALALALALALSDSRVLWAPAEAHPLSPQGHPARLHRIVPRLRDVFGWGNLTCPICKGLFTAINLGLKKEPNVARVGSVAIKLCNLLKIAPPAVCQSIVHLFEDDMVEVWRRSVLSPSEACGLLLGSTCGHWDIFSSWNISLPTVPKPPPKPPSPPAPGAPVSRILFLTDLHWDHDYLEGTDPDCADPLCCRRGSGLPPASRPGAGYWGEYSKCDLPLRTLESLLSGLGPAGPFDMVYWTGDIPAHDVWHQTRQDQLRALTTVTALVRKFLGPVPVYPAVGNHESTPVNSFPPPFIEGNHSSRWLYEAMAKAWEPWLPAEALRTLRIGGFYALSPYPGLRLISLNMNFCSRENFWLLINSTDPAGQLQWLVGELQAAEDRGDKVHIIGHIPPGHCLKSWSWNYYRIVARYENTLAAQFFGHTHVDEFEVFYDEETLSRPLAVAFLAPSATTYIGLNPGYRVYQIDGNYSGSSHVVLDHETYILNLTQANIPGAIPHWQLLYRARETYGLPNTLPTAWHNLVYRMRGDMQLFQTFWFLYHKGHPPSEPCGTPCRLATLCAQLSARADSPALCRHLMPDGSLPEAQSLWPRPLFC	5I81,5I85,5I8R,5JG8	Sphingomyelin phosphodiesterase	ASM_HUMAN	P17405	A8K8M3 E9PKS3 P17406 Q13811 Q16837 Q16841						
50590715	COc1c(O)cc2oc3cc(O)cc(O)c3c(=O)c2c1CC=C(C)C	InChI=1S/C19H18O6/c1-9(2)4-5-11-16-15(8-13(22)19(11)24-3)25-14-7-10(20)6-12(21)17(14)18(16)23/h4,6-8,20-22H,5H2,1-3H3	JZLXKPGAABLTJE-UHFFFAOYSA-N	50221658	CHEMBL110491	Sphingomyelin phosphodiesterase [1-45,48-631]	Homo sapiens		 15400							ChEMBL	10.1016/s0960-894x(03)00719-4	10.7270/Q2R49SZ9	12951083			Hamada, M; Iikubo, K; Ishikawa, Y; Ikeda, A; Umezawa, K; Nishiyama, S	Keio University	http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50221658	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=pol&polymerid=50001580&target=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=r21&monomerid=50221658&enzyme=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search			10405091	377008035		CHEMBL110491					1	MPRYGASLRQSCPRSGREQGQDGTAGAPGLLWMGLVLALALALALALSDSRVLWAPAEAHPLSPQGHPARLHRIVPRLRDVFGWGNLTCPICKGLFTAINLGLKKEPNVARVGSVAIKLCNLLKIAPPAVCQSIVHLFEDDMVEVWRRSVLSPSEACGLLLGSTCGHWDIFSSWNISLPTVPKPPPKPPSPPAPGAPVSRILFLTDLHWDHDYLEGTDPDCADPLCCRRGSGLPPASRPGAGYWGEYSKCDLPLRTLESLLSGLGPAGPFDMVYWTGDIPAHDVWHQTRQDQLRALTTVTALVRKFLGPVPVYPAVGNHESTPVNSFPPPFIEGNHSSRWLYEAMAKAWEPWLPAEALRTLRIGGFYALSPYPGLRLISLNMNFCSRENFWLLINSTDPAGQLQWLVGELQAAEDRGDKVHIIGHIPPGHCLKSWSWNYYRIVARYENTLAAQFFGHTHVDEFEVFYDEETLSRPLAVAFLAPSATTYIGLNPGYRVYQIDGNYSGSSHVVLDHETYILNLTQANIPGAIPHWQLLYRARETYGLPNTLPTAWHNLVYRMRGDMQLFQTFWFLYHKGHPPSEPCGTPCRLATLCAQLSARADSPALCRHLMPDGSLPEAQSLWPRPLFC	5I81,5I85,5I8R,5JG8	Sphingomyelin phosphodiesterase	ASM_HUMAN	P17405	A8K8M3 E9PKS3 P17406 Q13811 Q16837 Q16841						
50590718	COc1cc2c(cc1O)oc1cc(O)c(CC=C(C)C)c(O)c1c2=O	InChI=1S/C19H18O6/c1-9(2)4-5-10-12(20)7-16-17(18(10)22)19(23)11-6-15(24-3)13(21)8-14(11)25-16/h4,6-8,20-22H,5H2,1-3H3	LBXDNAOQXNHFGW-UHFFFAOYSA-N	50221659	CHEMBL107844	Sphingomyelin phosphodiesterase [1-45,48-631]	Homo sapiens		 102000							ChEMBL	10.1016/s0960-894x(03)00719-4	10.7270/Q2R49SZ9	12951083			Hamada, M; Iikubo, K; Ishikawa, Y; Ikeda, A; Umezawa, K; Nishiyama, S	Keio University	http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50221659	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=pol&polymerid=50001580&target=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=r21&monomerid=50221659&enzyme=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search			44337258	377008036		CHEMBL107844					1	MPRYGASLRQSCPRSGREQGQDGTAGAPGLLWMGLVLALALALALALSDSRVLWAPAEAHPLSPQGHPARLHRIVPRLRDVFGWGNLTCPICKGLFTAINLGLKKEPNVARVGSVAIKLCNLLKIAPPAVCQSIVHLFEDDMVEVWRRSVLSPSEACGLLLGSTCGHWDIFSSWNISLPTVPKPPPKPPSPPAPGAPVSRILFLTDLHWDHDYLEGTDPDCADPLCCRRGSGLPPASRPGAGYWGEYSKCDLPLRTLESLLSGLGPAGPFDMVYWTGDIPAHDVWHQTRQDQLRALTTVTALVRKFLGPVPVYPAVGNHESTPVNSFPPPFIEGNHSSRWLYEAMAKAWEPWLPAEALRTLRIGGFYALSPYPGLRLISLNMNFCSRENFWLLINSTDPAGQLQWLVGELQAAEDRGDKVHIIGHIPPGHCLKSWSWNYYRIVARYENTLAAQFFGHTHVDEFEVFYDEETLSRPLAVAFLAPSATTYIGLNPGYRVYQIDGNYSGSSHVVLDHETYILNLTQANIPGAIPHWQLLYRARETYGLPNTLPTAWHNLVYRMRGDMQLFQTFWFLYHKGHPPSEPCGTPCRLATLCAQLSARADSPALCRHLMPDGSLPEAQSLWPRPLFC	5I81,5I85,5I8R,5JG8	Sphingomyelin phosphodiesterase	ASM_HUMAN	P17405	A8K8M3 E9PKS3 P17406 Q13811 Q16837 Q16841						
50590720	COc1cc(C(=O)c2c(O)cc(O)c(CC=C(C)C)c2O)c(O)cc1O	InChI=1S/C19H20O7/c1-9(2)4-5-10-12(20)8-15(23)17(18(10)24)19(25)11-6-16(26-3)14(22)7-13(11)21/h4,6-8,20-24H,5H2,1-3H3	SHIUJCRFHIXGCI-UHFFFAOYSA-N	50221660	CHEMBL109045	Sphingomyelin phosphodiesterase [1-45,48-631]	Homo sapiens		 66600							ChEMBL	10.1016/s0960-894x(03)00719-4	10.7270/Q2R49SZ9	12951083			Hamada, M; Iikubo, K; Ishikawa, Y; Ikeda, A; Umezawa, K; Nishiyama, S	Keio University	http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50221660	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=pol&polymerid=50001580&target=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=r21&monomerid=50221660&enzyme=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search			44337239	377008037		CHEMBL109045					1	MPRYGASLRQSCPRSGREQGQDGTAGAPGLLWMGLVLALALALALALSDSRVLWAPAEAHPLSPQGHPARLHRIVPRLRDVFGWGNLTCPICKGLFTAINLGLKKEPNVARVGSVAIKLCNLLKIAPPAVCQSIVHLFEDDMVEVWRRSVLSPSEACGLLLGSTCGHWDIFSSWNISLPTVPKPPPKPPSPPAPGAPVSRILFLTDLHWDHDYLEGTDPDCADPLCCRRGSGLPPASRPGAGYWGEYSKCDLPLRTLESLLSGLGPAGPFDMVYWTGDIPAHDVWHQTRQDQLRALTTVTALVRKFLGPVPVYPAVGNHESTPVNSFPPPFIEGNHSSRWLYEAMAKAWEPWLPAEALRTLRIGGFYALSPYPGLRLISLNMNFCSRENFWLLINSTDPAGQLQWLVGELQAAEDRGDKVHIIGHIPPGHCLKSWSWNYYRIVARYENTLAAQFFGHTHVDEFEVFYDEETLSRPLAVAFLAPSATTYIGLNPGYRVYQIDGNYSGSSHVVLDHETYILNLTQANIPGAIPHWQLLYRARETYGLPNTLPTAWHNLVYRMRGDMQLFQTFWFLYHKGHPPSEPCGTPCRLATLCAQLSARADSPALCRHLMPDGSLPEAQSLWPRPLFC	5I81,5I85,5I8R,5JG8	Sphingomyelin phosphodiesterase	ASM_HUMAN	P17405	A8K8M3 E9PKS3 P17406 Q13811 Q16837 Q16841						
50590723	COc1c(O)cc(O)c(C(=O)c2c(O)cc(O)cc2O)c1CC=C(C)C	InChI=1S/C19H20O7/c1-9(2)4-5-11-16(14(23)8-15(24)19(11)26-3)18(25)17-12(21)6-10(20)7-13(17)22/h4,6-8,20-24H,5H2,1-3H3	WIUKUSDTCLQHKZ-UHFFFAOYSA-N	50221662	CHEMBL320658	Sphingomyelin phosphodiesterase [1-45,48-631]	Homo sapiens		 14700							ChEMBL	10.1016/s0960-894x(03)00719-4	10.7270/Q2R49SZ9	12951083			Hamada, M; Iikubo, K; Ishikawa, Y; Ikeda, A; Umezawa, K; Nishiyama, S	Keio University	http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50221662	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=pol&polymerid=50001580&target=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=r21&monomerid=50221662&enzyme=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search			44337250	377008039		CHEMBL320658					1	MPRYGASLRQSCPRSGREQGQDGTAGAPGLLWMGLVLALALALALALSDSRVLWAPAEAHPLSPQGHPARLHRIVPRLRDVFGWGNLTCPICKGLFTAINLGLKKEPNVARVGSVAIKLCNLLKIAPPAVCQSIVHLFEDDMVEVWRRSVLSPSEACGLLLGSTCGHWDIFSSWNISLPTVPKPPPKPPSPPAPGAPVSRILFLTDLHWDHDYLEGTDPDCADPLCCRRGSGLPPASRPGAGYWGEYSKCDLPLRTLESLLSGLGPAGPFDMVYWTGDIPAHDVWHQTRQDQLRALTTVTALVRKFLGPVPVYPAVGNHESTPVNSFPPPFIEGNHSSRWLYEAMAKAWEPWLPAEALRTLRIGGFYALSPYPGLRLISLNMNFCSRENFWLLINSTDPAGQLQWLVGELQAAEDRGDKVHIIGHIPPGHCLKSWSWNYYRIVARYENTLAAQFFGHTHVDEFEVFYDEETLSRPLAVAFLAPSATTYIGLNPGYRVYQIDGNYSGSSHVVLDHETYILNLTQANIPGAIPHWQLLYRARETYGLPNTLPTAWHNLVYRMRGDMQLFQTFWFLYHKGHPPSEPCGTPCRLATLCAQLSARADSPALCRHLMPDGSLPEAQSLWPRPLFC	5I81,5I85,5I8R,5JG8	Sphingomyelin phosphodiesterase	ASM_HUMAN	P17405	A8K8M3 E9PKS3 P17406 Q13811 Q16837 Q16841						
50590724	COc1c(O)cc2oc3cc(O)c(CC=C(C)C)c(O)c3c(=O)c2c1CC=C(C)C	InChI=1S/C24H26O6/c1-12(2)6-8-14-16(25)10-19-21(22(14)27)23(28)20-15(9-7-13(3)4)24(29-5)17(26)11-18(20)30-19/h6-7,10-11,25-27H,8-9H2,1-5H3	GNRIZKKCNOBBMO-UHFFFAOYSA-N	50214969	1,3,6-Trihydroxy-7-methoxy-2,8-bis-(3-methyl-but-2-enyl)-xanthen-9-one::1,3,6-trihydroxy-7-methoxy-2,8-bis(3-methylbut-2-enyl)-9H-xanthen-9-one::1,3,6-trihydroxy-7-methoxy-2,8-diprenylxanthone::CHEMBL323197::Mangostin::alpha-mangostin	Sphingomyelin phosphodiesterase [1-45,48-631]	Homo sapiens		 12600							ChEMBL	10.1016/s0960-894x(03)00719-4	10.7270/Q2R49SZ9	12951083			Hamada, M; Iikubo, K; Ishikawa, Y; Ikeda, A; Umezawa, K; Nishiyama, S	Keio University	http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50214969	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=pol&polymerid=50001580&target=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=r21&monomerid=50214969&enzyme=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search	MKS	6AA4,4Y9B,4Y9C	5281650	104089789	67547	CHEMBL323197			C10080	ZINC05430812	1	MPRYGASLRQSCPRSGREQGQDGTAGAPGLLWMGLVLALALALALALSDSRVLWAPAEAHPLSPQGHPARLHRIVPRLRDVFGWGNLTCPICKGLFTAINLGLKKEPNVARVGSVAIKLCNLLKIAPPAVCQSIVHLFEDDMVEVWRRSVLSPSEACGLLLGSTCGHWDIFSSWNISLPTVPKPPPKPPSPPAPGAPVSRILFLTDLHWDHDYLEGTDPDCADPLCCRRGSGLPPASRPGAGYWGEYSKCDLPLRTLESLLSGLGPAGPFDMVYWTGDIPAHDVWHQTRQDQLRALTTVTALVRKFLGPVPVYPAVGNHESTPVNSFPPPFIEGNHSSRWLYEAMAKAWEPWLPAEALRTLRIGGFYALSPYPGLRLISLNMNFCSRENFWLLINSTDPAGQLQWLVGELQAAEDRGDKVHIIGHIPPGHCLKSWSWNYYRIVARYENTLAAQFFGHTHVDEFEVFYDEETLSRPLAVAFLAPSATTYIGLNPGYRVYQIDGNYSGSSHVVLDHETYILNLTQANIPGAIPHWQLLYRARETYGLPNTLPTAWHNLVYRMRGDMQLFQTFWFLYHKGHPPSEPCGTPCRLATLCAQLSARADSPALCRHLMPDGSLPEAQSLWPRPLFC	5I81,5I85,5I8R,5JG8	Sphingomyelin phosphodiesterase	ASM_HUMAN	P17405	A8K8M3 E9PKS3 P17406 Q13811 Q16837 Q16841						
50590725	COc1c(O)cc(O)c(C(=O)c2c(O)cc(O)c(CC=C(C)C)c2O)c1CC=C(C)C	InChI=1S/C24H28O7/c1-12(2)6-8-14-16(25)10-18(27)21(22(14)29)23(30)20-15(9-7-13(3)4)24(31-5)19(28)11-17(20)26/h6-7,10-11,25-29H,8-9H2,1-5H3	ZRQRQNWUUGSFQH-UHFFFAOYSA-N	50221661	CHEMBL110445	Sphingomyelin phosphodiesterase [1-45,48-631]	Homo sapiens		 39600							ChEMBL	10.1016/s0960-894x(03)00719-4	10.7270/Q2R49SZ9	12951083			Hamada, M; Iikubo, K; Ishikawa, Y; Ikeda, A; Umezawa, K; Nishiyama, S	Keio University	http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50221661	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=pol&polymerid=50001580&target=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search	http://www.bindingdb.org/jsp/dbsearch/PrimarySearch_ki.jsp?energyterm=kJ/mole&tag=r21&monomerid=50221661&enzyme=Sphingomyelin+phosphodiesterase+%5B1-45%2C48-631%5D&column=ki&startPg=0&Increment=50&submit=Search			11080475	377008038		CHEMBL110445					1	MPRYGASLRQSCPRSGREQGQDGTAGAPGLLWMGLVLALALALALALSDSRVLWAPAEAHPLSPQGHPARLHRIVPRLRDVFGWGNLTCPICKGLFTAINLGLKKEPNVARVGSVAIKLCNLLKIAPPAVCQSIVHLFEDDMVEVWRRSVLSPSEACGLLLGSTCGHWDIFSSWNISLPTVPKPPPKPPSPPAPGAPVSRILFLTDLHWDHDYLEGTDPDCADPLCCRRGSGLPPASRPGAGYWGEYSKCDLPLRTLESLLSGLGPAGPFDMVYWTGDIPAHDVWHQTRQDQLRALTTVTALVRKFLGPVPVYPAVGNHESTPVNSFPPPFIEGNHSSRWLYEAMAKAWEPWLPAEALRTLRIGGFYALSPYPGLRLISLNMNFCSRENFWLLINSTDPAGQLQWLVGELQAAEDRGDKVHIIGHIPPGHCLKSWSWNYYRIVARYENTLAAQFFGHTHVDEFEVFYDEETLSRPLAVAFLAPSATTYIGLNPGYRVYQIDGNYSGSSHVVLDHETYILNLTQANIPGAIPHWQLLYRARETYGLPNTLPTAWHNLVYRMRGDMQLFQTFWFLYHKGHPPSEPCGTPCRLATLCAQLSARADSPALCRHLMPDGSLPEAQSLWPRPLFC	5I81,5I85,5I8R,5JG8	Sphingomyelin phosphodiesterase	ASM_HUMAN	P17405	A8K8M3 E9PKS3 P17406 Q13811 Q16837 Q16841