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Compound 32 (0.76 g, 1.2 mmol) was deblocked in the same manner as described for 31 above using sodium methoxide (200 mg, 3.7 mmol) in dry MeOH (50 mL). The title compound (34) was obtained (0.12, 32%) after crystallization from water: mp 248°-250° C.: UV λmax (pH 1) 222 nm (ε35100), 265 (14300), 290 (11400): UV λmax (pH 7, 11) 215 nm (ε45000), 262 (13200): 1H NMR (DMSO-d6) δ5.91 (d, J=5.43 Hz, 1H, C1,H), 7.44 (b, 1H, NH2), 8.22 (s, 1H, C5H), and other sugar protons. Anal. Calcd. for C10H12N4O5S: C, 40.00: H, 4.03: N, 18.66: S, 10.68. Found: C, 39.80: H, 3.99: N, 18.39: S, 10.57. ##STR7##