SYSTEMATIC RETROSYNTHETIC ANALYSIS APPLIED IN THE PREPARATION OF ANTIFUNGAL 5,6-DIHYDRO-1,4-OXATHIINES AND 5,6-DIHYDRO-1,4-DITHIINES. THE MERITS OF MANUAL AND COMPUTER-ASSISTED SYNTHETIC ANALYSES AND EVALUATION OF SYNTHETIC PATHWAYS VERIFIED BY - Nevalainen, Vesa (Chemica, 1988)