(Z,2S,3R,8R,9S)-3-tert-butyldiphenylsilanyloxy-2-ethyl-8-(4-methoxybenzyloxy)-9-((Z)-5-triisopropylsilanylpent-2-en-4-ynyl)-2,3,4,7,8,9-hexahydrooxonine

(Z,2S,3R,8R,9S)-3-tert-butyldiphenylsilanyloxy-2-ethyl-8-(4-methoxybenzyloxy)-9-((Z)-5-trimethylsilanylpent-2-en-4-ynyl)-2,3,4,7,8,9-hexahydrooxonine

(Z,2S,3S,8R,9S)-3-bromo-2-ethyl-8-(4-methoxybenzyloxy)-9-((Z)-pent-2-en-4-ynyl)-2,3,4,7,8,9-hexahydrooxonine

(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)-2-ethyl-3-hydroxy-8-(4-methoxybenzyloxy)-9-((Z)-pent-2-en-4-ynyl)-2,3,4,7,8,9-hexahydrooxonine