... Heterocyclic Chem., 28, 301 (1991). ... Chemical ionisation mass spectra were recorded using methane as the ionising gas. ... in vacuo to give 4.8 g (92%) of the hydroxytriazole 5b, mp 109° (lit [19] mp 117°); ir: 3350 cm1 (OH), 1700 cm1 (C = 0); 'H nmr: Ô 1.30 (t, CH3, 3H, J = 7 Hz ...