prov:value
| - d together to form benzene-condensed lower alkylene, A is a bivalent residue derived from an amino acid selected from the group consisting of proline, hydroxyproline, glycine, serine, asparagine, aminoisobutyric acid, azetidinecarboxylic acid, thioproline, aspartic acid, lysine, methionine, threonine, alanine, ornithine, hydroxypiperidinecarboxylic acid, 4-acyloxyproline, 4-lower alkoxyproline, 4-
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