domain is loaded with 2-oxoisovaleric acid and incorporates α-hydroxy acid 2-hydroxyisovaleric acid. Module 10 on PKS DidG adds a second round of malonate extension. The MT domain on DidG adds an α-methyl group to this residue. Monomodular domains DidH, DidI and DidJ elongate the chain with respectively leucine, proline and tyrosine. The two MT domains on DidJ methylates tyrosine twice, to yield N-methyl-O-methyl-tyrosine, finalizing the assembly of linear didemnin B. The Thioesterase (TE) domain on module DidJ releases the product in its cyclized form. See also Trabectedin References Depsipeptides