73666-80-5 Bleomycin B6 Bleomycinamide, N1-(20-amino-6,13,20-triimino-5,7,12,14,19-pentaazaeicos-1-yl)- N1-(20-Amino-6,13,20-triimino-5,7,12,14,19-pentaazaeicos-1-yl)bleomycinamide