77026-80-3 77026-81-4 96861-08-4 DN 1417 L-Prolinamide, N-((tetrahydro-5-oxo-2-furanyl)carbonyl)-L-histidyl-, 2-hydroxy-1,2,3-propanetricarboxylate (1:1) gamma-Butyrolactone-gamma-carbonyl-histidyl-prolinamide citrate