102301-13-3 Antibiotic 273 A2-beta L-Cysteine, N-acetyl-, (1-carboxy-1-propenyl)carbamodithioate (ester), 4'-ester with 5-(6-O-acetyl-3-O-(2,6-dideoxy-3-O-methyl-4-C-(1-(2-methyl-1-oxopropoxy)ethyl)-alpha-L-lyxo-hexopyranosyl)-beta-D-allopyranosyl)-2-amino-5-hydroxy-3,6-dioxo-1-cyclohexene-1-carboxylic acid