The molecule is a type-B lantibiotic containing 3-methyllanthionine and S-(2-aminovinyl)-3-methylcysteine residues and four intra-chain thioether bridges. It is obtained from Bacillus sp. HIL Y-85,54728 and is active in vivo against methicillin-resistant Staphylococcus aureus (MRSA). It has a role as a metabolite and an antibacterial agent. It is a type B lantibiotic and a macrocycle. It is a tautomer of a mersacidin zwitterion.
3-[(4S,7S,8S,11R,14S,17E,20S,26S)-7-[[(3S,6S,7S,10R,13S,28S)-6-[[(2S)-2-[[(2S,3S,6R)-6-amino-2-methyl-5-oxo-1,4-thiazepane-3-carbonyl]amino]-3-phenylpropanoyl]amino]-7-methyl-3-(2-methylpropyl)-2,5,12,15,18,21,24,27-octaoxo-13-propan-2-yl-8-thia-1,4,11,14,17,20,23,26-octazabicyclo[26.3.0]hentriacontane-10-carbonyl]amino]-14-[(2R)-butan-2-yl]-8,20-dimethyl-23-methylidene-4-(2-methylpropyl)-3,6,12,15,21,24,27-heptaoxo-9,19-dithia-2,5,13,16,22,25,28-heptazabicyclo[9.9.8]octacos-17-en-26-yl]propanoic acid