(E)-3-Methyl-4-oxo-but-2-enoic acid 2-trimethylsilanyl-ethyl ester

succinic acid mono-[1-{2-butyl-7-[3,7-dimethyl-6-triisopropylsilanyloxy-9-(2-trimethylsilanyl-ethoxycarbonyl)-nona-2,4,8-trienyl]-8-methyl-1,6-dioxa-spiro[4.5]dec-2-yl}-4-methyl-5-(2-trimethylsilanyl-ethoxycarbonyl)-penta-2,4-dienyl] ester

10-{2-butyl-8-methyl-2-[4-methyl-5-(2-trimethylsilanyl-ethoxycarbonyl)-penta-2,4-dienoyl]-1,6-dioxa-spiro[4.5]dec-7-yl}-4,8-dimethyl-5-triisopropylsilanyloxy-deca-2,6,8-trienoic acid 2-trimethylsilanyl-ethyl ester