1-Acetyl-1,2,3,3a,8,8a-hexahydro-8a-hydroxy-5-methoxypyrrolo(2,3-b)indole 109210-52-8 CHMI Cyclic 2-hydroxymelatonin isomer Pyrrolo(2,3-b)indol-8a(1H)-ol, 1-acetyl-2,3,3a,8-tetrahydro-5-methoxy-