The molecule is a polycyclic ether comprising a linear sequence of sequence of five trans-fused oxacycles and one spiro-fused tetrahydrofuran ring. It has a role as a hapten. It is a polycyclic ether and a cyclic acetal.
2-[(1R,3S,5R,6S,7S,8R,10S,11S,12S,13R,15S,17R,19R,24S)-10,11-dihydroxy-6,7,12,17-tetramethylspiro[4,9,14,20,22,25-hexaoxapentacyclo[13.10.0.03,13.05,10.019,24]pentacosane-8,2'-oxolane]-21-yl]acetic acid