IUPAC Name: (5R,8S,11R,12S,15S,18S,19S,22R)-15-[3-(diaminomethylideneamino)propyl]-18-[(1E,3E,5S,6S)-6-methoxy-3,5-dimethyl-7-phenylhepta-1,3-dienyl]-1,5,12,19-tetramethyl-2-methylidene-8-(2-methylpropyl)-3,6,9,13,16,20,25-heptaoxo-1,4,7,10,14,17,21-heptazacyclopentacosane-11,22-dicarboxylic acid

Source: Occurs naturally as a cyanotoxin produced by cyanobacteria.

Water Treatment: https://tdb.epa.gov/tdb/contaminant?id=-1336577584

Summary: Microcystin-LR is a cyanotoxin produced by cyanobacteria. It is the most toxic of the group of microcystins. It has a role as an enzyme inhibitor. It has dissociation constants of pKa(1) = 2.09, pKa(2) = 2.19, and pKa(3) = 12.48. The compound is highly soluble in water, and is not expected to adsorb to suspended solids. Biodegradation half-lives have been measured ranging from 0.2 – 3.6 days, indicating that it may be an important fate process in water.

GHS Hazard Statement: H300, H310, H315, H317, H319, H335, GHS06, GHS07