(3S,6S)-3-(1H-Indol-3-ylmethyl)-6-methyl-2,5-piperazinedione;(3S,6S)-3-(1H-Indole-3-ylmethyl)-6-methylpiperazine-2,5-dione;Cyclo(L-Ala-L-Trp-);Cyclo(L-Trp-L-Ala-)
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