15-(3-Guanidino-propyl)-5,8-diisobutyl-18-(6-methoxy-3,5-dimethyl-7-phenyl-hepta-1,3-dienyl) -1,2,12,19-tetramethyl-3,6,9,13,16,20,25-heptaoxo-1,4,7,10,14,17,21heptaaza -cyclopentacosane-11,22-dicarboxylic acid InChI=1/C52H80N10O12/c1-28(2)24-39-48(68)60-40(25-29(3)4)49(69)61-43(51(72)73)33(8)45(65)57-37(18-15-23-55-52(53)54)47(67)56-36(20-19-30(5)26-31(6)41(74-11)27-35-16-13-12-14-17-35)32(7)44(64)58-38(50(70)71)21-22-42(63)62(10)34(9)46(66)59-39/h12-14,16-17 [D-Leu^(1)]-microcystin-LR rel-(5R,8S,11R,12S,15S,18S,19S,22R)-15-(3-{[amino(imino)methyl]amino}propyl)-5,8-diisobutyl-18-[(1E,3E,5S,6S)-6-methoxy-3,5-dimethyl-7-phenylhepta-1,3-dien-1-yl]-1,12,19-trimethyl-2-methylene-3,6,9,13