ethyl (1R,4S,5R,7S)-4-benzyloxy-8-ethoxy-3,3-dimethyl-10(Z)-benzoylmethylidene-tricyclo[5.2.1.01,5]dec-8-ene-7-carboxylate

(3S,6RS)-3-benzyloxy-4,4-dimethyl-6-hydroxy-1-octen-7-yne

(7S)-7-benzyloxy-6,6-dimethyl-1-phenylnon-8-en-2-yne-1,4-dione

ethyl 4-((3S)-3-benzyloxy-2,2-dimethyl-pent-4-en-1-yl)-2-ethoxy-5(Z)-benzoylmethylidene-1,3-cyclopentadiene-1-carboxylate

ethyl 4-((3S)-3-benzyloxy-2,2-dimethyl-pent-4-en-1-yl)-2-ethoxy-5(E)-benzoylmethylidene-1,3-cyclopentadiene-1-carboxylate