bay r 1531 bay r 1531 bay r 1531 is a tricyclic tryptamine derivative which acts as a selective serotonin receptor 5-ht1a agonist. it was researched unsuccessfully for the treatment of stroke but remains in use for scientific research. bay r 1531identifiers iupac name 1,3,4,5-tetrahydro-6-methoxy-n,n-dipropyl-benzindol-4-amine cas number98770-54-8pubchem cid127153chemspider112872comptox dashboard (epa)dtxsid80913088 chemical and physical dataformulac18h28n2omolar mass288.435 g·mol−13d model (jsmol)interactive image smiles coc2ccc1cc3cc(cc2c13)n(ccc)ccc inchi inchi=1s/c18h26n2o/c1-4-8-20(9-5-2)14-10-13-12-19-16-6-7-17(21-3)15(11-14)18(13)16/h6-7,12,14,19h,4-5,8-11h2,1-3h3key:bmzwfsgtpjukjr-uhfffaoysa-n