4.2.99.22 1,6-tuliposide D - 4.2.99.22 6-tuliposide A - 4.2.99.22 6-tuliposide B low activity 4.2.99.22 additional information TCE enzymes are lactone-forming enzymes and a non-ester-hydrolyzing carboxylesterase, and specifically catalyze intramolecular transesterification, but not hydrolysis