Synonyms: L-Phenylalaninamide,1-(3-carboxy-1-oxopropyl)-N-[[(3S,9aS)-octahydro-1,4-dioxo-6,9-ethano-2H-pyrido[1,2-a]pyrazin-3-yl]acetyl]-D-tryptophyl-N-methyl-N-(phenylmethyl)-,monosodium salt (9CI); 6,9-Ethano-2H-pyrido[1,2-a]pyrazine, L-phenylalaninamidederiv.; S 16474