cy-208,243 cy-208,243 cy-208,243 is a drug which acts as a dopamine agonist selective for the d1 subtype. unlike most d1-selective agonists, it shows efficacy in animal models of parkinson's disease. cy-208,243identifiers iupac name 4,6,6a,7,8,12b-hexahydro-7-methylindolo(4,3-ab)-phenanthridine cas number100999-26-6 ypubchem cid58144chemspider52380 nunii8gj4ur780bcomptox dashboard (epa)dtxsid9042598 chemical and physical dataformulac19h18n2molar mass274.367 g·mol−13d model (jsmol)interactive image smiles c15c4cc5cc2c(c1ccc4)c3ccccc3cn2c inchi inchi=1s/c19h18n2/c1-21-11-12-5-2-3-6-14(12)19-15-7-4-8-16-18(15)13(10-20-16)9-17(19)21/h2-8,10,17,19-20h,9,11h2,1h3/t17-,19-/m1/s1 nkey:wrnkidlxxxielu-iebwsbkvsa-n n ny (what is this?) (verify)