Cyclo(L-Trp-L-Ala-)

Cyclo(L-Ala-L-Trp-)

(3S,6S)-3-(1H-Indol-3-ylmethyl)-6-methyl-2,5-piperazinedione

(3S,6S)-3-(1H-Indole-3-ylmethyl)-6-methylpiperazine-2,5-dione