Occurs in 2 forms which differ in the post-translational modification of Cys-1. In form Eudistomide A cysteine is modified to N-(12-oxomyristoyl)cysteine while in form Eudistomide B cysteine is modified to N-[(12R)-12-hydroxymyristoyl]cysteine (PubMed:19053188). The measured mass is that of Eudistomide A. The measured mass is that of Eudistomide B.