CONFIGURATION AND STEREOCHEMISTRY OF PHOTOPRODUCTS BY APPLICATION OF NUCLEAR OVERHAUSER EFFECT - ADDUCTS OF BENZOPHENONE WITH METHYL-SUBSTITUTED FURANS AND 2,5-DIMETHYLTHIOPHEN, AND OF METHYL-SUBSTITUTED MALEIC ANHYDRIDES WITH THIOPHENE AND ITS METHYL-DERIVATIVES, AND BENZO-[B]THIOPHEN