STUDIES ON THE TOTAL SYNTHESIS OF CC-1065 - PREPARATION OF A SYNTHETIC, SIMPLIFIED 3-CARBAMOYL-1,2-DIHYDRO-3H-PYRROLO[3,2-E]INDOLE DIMER/TRIMER/TETRAMER (CDPI DIMER/TRIMER/TETRAMER) AND DEVELOPMENT OF METHODOLOGY FOR PDE-I DIMER METHYL-ESTER FORMATION