Skeletal formula of members of the cryptophycin family: cryptophycin A, cryptophycin B, and arenastatin A (cryptophycin-24), with the four substructural fragments highlighted in color. See <a rel="nofollow" class="external text" href="https://dx.doi.org/10.1039/C3NP70022D">Weiss et al. <i>Nat Prod Rep</i> 2013</a> for fragment definitions and <a rel="nofollow" class="external text" href="https://dx.doi.org/10.1021/ol000058i">Ghosh et al. <i>Org Lett</i> 2000</a> for R-group definitions.
<a href="//commons.wikimedia.org/wiki/User:Opabinia_regalis" title="User:Opabinia regalis">Opabinia regalis</a>
<span class="int-own-work" lang="en">Own work</span>