https://doi.org/10.1351/goldbook.A00261
A prefix used to indicate that a molecule with two (or more) @C01057@ elements is present as a mixture of the two @R05026@ @D01679@ in unspecified proportions. For example, the dipeptide formed from l-alanine and dl-leucine is l-alanyl-ambo-leucine.
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2198 [Terms] [Paper]