SYNTHESIS AND ANTIMICROBIAL ACTIVITY OF SOME 1,5-DIARYL-2-METHYL-3-CARBETHOXY-4-(4-METHYL-PIPERAZIN-1-YLMETHYL)-PYRROLES AND SOME 1,5-DIARYL-2-METHYL-3,4-DI(4-METHYL-PIPERAZIN-1-YLMETHYL)-PYRROLES