[(5S,6S)-4-amino-2-{[(1R)-1-carboxyethyl]carbamoyl}-5-{[4,6-dideoxy-4-(dimethylamino)-3-O-beta-D-xylopyranosyl-beta-D-galactopyranosyl]oxy}-1,6,9,14-tetrahydroxy-11-methoxy-3-methyl-8,13-dioxo-5,6,8,13-tetrahydrobenzo[a]tetracen-10-yl]-N,N,N-trimethylmeth