(Z,2S,4aS,6S,7R,11aR)-7-tert-butyldiphenylsilanyloxy-6-ethyl-2-(4-methoxyphenyl)-4a,6,7,8,11,11a-hexahydro-4H-1,3,5-trioxabenzocyclononene

(Z,2S,3R,8R,9S)-8-tert-butyldiphenylsilanyloxy-9-ethyl-2-formylmethyl-3-(4-methoxybenzyloxy)-2,3,4,7,8,9-hexahydrooxonine

(Z,2S,3R,8R,9S)-8-tert-butyldiphenylsilanyloxy-9-ethyl-2-hydroxymethyl-3-(4-methoxybenzyloxy)-2,3,4,7,8,9-hexahydrooxonine

(Z,2S,3R,8R,9S)-8-tert-butyldiphenylsilanyloxy-2-cyanomethyl-9-ethyl-3-(4-methoxybenzyloxy)-2,3,4,7,8,9-hexahydrooxonine

(Z,2S,3R,8R,9S)-3-tert-butyldiphenylsilanyloxy-2-ethyl-9-((Z)-3-iodoprop-3-enyl)-8-(4-methoxybenzyloxy)-2,3,4,7,8,9-hexahydrooxonine