103733-50-2 2H-Pyrazino(1,2-b)isoquinoline-2-acetic acid, 1,3,4,6,11,11a-hexahydro-3-methyl-1,4-dioxo-alpha-(2-phenylethyl)-, (3S-(2(R*),3alpha,11abeta))- PD 113413 PD-113413