L-arginine malate Arginine malate (S)-2-Amino-5-guanidinopentanoic acid 2-hydroxysuccinic acid (1:1) L-Arginine,compounds,hydroxybutanedioate L- Arginine Malate USP/EP/BP Arginine malate USP/EP/BP (2S)-2-amino-5-(diaminomethylideneamino)pentanoic acid,2-hydroxybutanedioic acid