65125-89-5

(2S,5R)-6-[[2-[(4-butyl-2,3-dioxo-piperazine-1-carbonyl)amino]-2-pheny l-acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2 -carboxylic acid