34522-32-2 Arginine, N2-(1-carboxyethyl)-, L- CPD-309 D-(+)-Octopine D-Octopine L-Arginine, N2-(1-carboxyethyl)-, (R)- L-Arginine, N2-[(1R)-1-carboxyethyl]- N2-(1-Carboxyethyl)-L-arginine Octopine