1,8-Diethyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid 41340-25-4 AY 24236 AY-24,236 Etodolic acid NSC282126 Pyrano[3,4-b]indole-1-acetic acid, 1,8-diethyl-1,3,4,9-tetrahydro-