heterodetic cyclic peptide

https://doi.org/10.1351/goldbook.H02800
A @P04479@ consisting only of @A00279@, but in which the linkages forming the ring are not solely @E02224@ bonds; one or more is an @I03303@, disulfide, @E02219@, or other bond.
Source:
White Book, 2nd ed., p. 59 [Terms] [Book]