The molecule is a polycyclic ether comprising a linear sequence of sequence of six trans-fused six-, seven- and eight-membered oxacycles. It has a role as a hapten. It is a polycyclic ether and a cyclic acetal.
2-[(1S,3R,5Z,7S,12R,14S,17R,19S,20R,21R,27S,29R)-20-hydroxy-2,8,10,13,18,22,28-heptaoxahexacyclo[15.13.0.03,14.07,12.019,29.021,27]triaconta-5,15,24-trien-9-yl]acetic acid