Cyl-1

Cyclo(Aoe-D-Tyr(Me)-Ile-Pro-)

Cyclo[L-Ile-L-Pro-6-[2-[(S)-oxiranyl]-2-oxoethyl]-L-Nle-O-methyl-D-Tyr-]

Cyclo[L-Ile-L-Pro-[(S)-8-oxo-2-amino*-8-[(S)-oxiranyl]octanoyl]-O-(methyl)-D-Tyr-]