c28h43oh

from The Collaborative International Dictionary of English v.0.48

calciferol \cal*cif"er*ol\ n.
   one of the forms of {vitamin D}, a fat-soluble vitamin that
   prevents rickets. It is an unsaturated alcohol, {C28H43OH}
   found in foods such as milk and fish liver oils. It is used
   as a dietary supplement in milk.

   Syn: vitamin D, ergocalciferol, cholecarciferol, D.
        [WordNet 1.5 +PJC]