Two new cyclic peptides were isolated from the fruit peels of Citrus medica var. sarcodactylis SWINGLE. Their structures were elucidated as cyclo(–Gly–Asp–Leu–Thr–Val–Tyr–Phe–) and cyclo(–Gly–Leu–Pro–Trp–Leu–Ile–Ala–Ala–) by intensive two-dimensional (2D) NMR analysis and chemical evidence.
