103716-12-7 Calicheamicin alpha 2 Carbamic acid, (8-((4,6-dideoxy-2-O-(2,4-dideoxy-4-(ethylamino)-3-O-methyl-alpha-L-threo-pentopyranosyl)-4-(((2,6-dideoxy-4-S-(4-hydroxy-3-iodo-5,6-dimethoxy-2-methylbenzoyl)-4-thio-beta-D-ribo-hexopyranosyl)oxy)amino)-beta-D-glucopyranosyl)oxy)-1-hyddroxy-13-(2-(methyltrithio)ethylidene)-11-oxobicyclo(7.3.1)trideca-4,9-diene-2,6-diyn-10-yl)-, methyl ester, (1R-(1R*,4Z,8S*,13E))-