- Biosynthesis of a C21 steroid conjugate in an insect. The conversion of [14C]cholesterol to 5-[14C]pregnen-3 beta,20 beta-diol glucoside in the tobacco hornworm, Manduca sexta. Thompson, M.J., Svoboda, J.A., Lusby, W.R., Rees, H.H., Oliver, J.E., Weirich, G.F., Wilzer, K.R. J. Biol. Chem. (1985)