Tyrocidine A

Cyclo(D-Phe-Pro-Phe-D-Phe-Asn-Gln-Tyr-Val-Orn-Leu-)

Cyclo[L-Asn-L-Gln-L-Tyr-L-Val-L-Orn-L-Leu-D-Phe-L-Pro-L-Phe-D-Phe-]