(2E)-9-[3-(diaminomethylideneamino)propyl]-2-ethylidene-12-[(1E,3E)-6-methoxy-3,5-dimethyl-7-phenylhepta-1,3-dienyl]-1,6,13-trimethyl-3,7,10,14,19-pentaoxo-1,4,8,11,15-pentazacyclononadecane-5,16-dicarboxylic acid
Nodularin-R is a cyclic nonribosomal peptide produced by the planktonic cyanobacterium <i>Nodularia spumigena</i>. This cyanobacterium forms blooms in brackish water bodies throughout the world. Nodularin-R is a pentapeptide and contains several unusual non-proteinogenic amino acids such as methyldehydrobutyrine and the _-amino acid ADDA, (all-S,all-E)-3-amino-9-methoxy-2,6,8-trimethyl-10-phenyldeca-4,6-dienoic acid. Nodularin-R is a cyanotoxin and poses a health risk for wild and domestic animals as well as humans. Nodularin-R is a potent hepatotoxin and may cause serious damage to the liver.