3,5-m-pyridyl-bis-distamycin 3,5-meta-Pyridyl bis{N-[5-[[(amino-3-iminopropyl)amino]carbonyl]-1-methyl-1H-pyrrol-3-yl-4-[[(4-(formylamino)-1-methyl-1H-pyrrol-2yl]carbonyl]amino]-1H-pyrrole-2-carboxamide} AIDS-104184 AIDS104184 MPyr m-pyridyl bis-distamycin