tb-21007 tb-21007 tb-21007 is a nootropic drug which acts as a subtype-selective inverse agonist at the α5 containing gabaa receptors. tb-21007identifiers iupac name 6,6-dimethyl-3-(2-hydroxyethyl)thio-1-(thiazol-2-yl)-6,7-dihydro-2-benzothiophen-4(5h)-one cas number207306-50-1 ypubchem cid6918633chemspider5293826 nuniivl2nqq83rnchemblchembl17603 ncomptox dashboard (epa)dtxsid40426083 chemical and physical dataformulac15h17no2s3molar mass339.49 g·mol−13d model (jsmol)interactive image smiles s3ccnc3-c2sc(scco)c1c2cc(c)(c)cc1=o inchi inchi=1s/c15h17no2s3/c1-15(2)7-9-11(10(18)8-15)14(20-6-4-17)21-12(9)13-16-3-5-19-13/h3,5,17h,4,6-8h2,1-2h3 nkey:qilryfcexlfids-uhfffaoysa-n n ny (what is this?) (verify)