1-Piperidinepropanoic acid, 4-(methoxycarbonyl)-4-((1-oxopropyl)phenylamino)- 132875-68-4 4-Methoxycarbonyl-4-((1-oxopropyl)phenylamino)-1-piperidine propionic acid GI 90291 GI-90291 GR 90291 GR 90291C