Answers are grounded in this paper and cite their sources.
Antibiotic 1233A is shown to be 12-hydroxy-13-hydroxymethyl-3,5,7-trimethyltetradeca-2,4-dienedioic acid 12,14-lactone (1).
No takes yet. Share an insight, caveat, or question.
Aldridge et al. (1970) studied this question.