... Jul-Aug 1996 Synthesis of some 6-S-Heterocyclic Derivatives 1343 (three signals, CH3- groups, one more intense) ppm; ms: (type 1) m/z 370 (M+-), 355 (A+), 297 (D+), 227 (D ... [9] K. Biemann and JA Mc Closkey, J. Am ... 10] OT Schmidt, Methods in Carbohydrate Chemistry, II, 1963 ...