114153-91-2 Kanglemeisu A Kanglemycin A Rifamycin, 20-(1-(3-carboxy-2,2-dimethyl-1-oxopropoxy)ethyl)-20-demethyl-27-O-demethyl-1,4-dideoxy-27-O-(2,6-dideoxy-3,4-O-methylene-beta-D-ribo-hexopyranosyl)-1,4-dihydro-1,4-dioxo-