antrimycin

Antrimycin A

Cirratiomycin B

(-)-[(E)-2-[[[(6S)-1-[(3S)-N-(2-Hydroxymethyl Ser-L-Ala-)-3-amino-L-Abu-]-1,4,5,6-tetrahydropyridazine-6-yl]carbonyl-L-Ala-]amino]-3-methyl-2-pentenoyl]-L-Ser-OH