69584-54-9 BRN 1694647 Methyl-3NITROSO-3 ureido-1' O-isopropylidene-2',3'-O-p-nitrobenz oyl-5' ribofurannose Urea, 1-methyl-1-nitroso-3-(5-O-(p-nitrobenzoyl)-2,3-O-isopropylideneribofuranos-1-yl)-