(1aS)-7,9-Dihydroxy-8beta-(hydroxymethyl)-1aalpha,8,9,9aalpha-tetrahydro-2H-3beta,9beta-epoxy-1H-azirino[2,3-c][1]benzoazocine-1,5-dicarboxylic acid 1-tert-butyl 5-methyl ester

(1aS)-7,9-Dihydroxy-8beta-(hydroxymethyl)-1aalpha,8,9,9aalpha-tetrahydro-2H-3beta,9beta-epoxy-1H-azirino[2,3-c][1]benzoazocine-1,5-dicarboxylic acid 1-tert-butyl 5-methyl ester