label: 1-(2-chloroethyl)-3-(1'-(5'-4-nitrobenzoyl-2',3'-isopropylidene)-alpha,beta-D-ribofuranosyl)-1-nitrosourea
label_lc: 1-(2-chloroethyl)-3-(1'-(5'-4-nitrobenzoyl-2',3'-isopropylidene)-alpha,beta-d-ribofuranosyl)-1-nitrosourea