Carbonic acid,(1S,2S,4E)-2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-[(1R)-1,3,3-trimethyl-4,4-bis(1-methylethoxy)-2-oxobutyl]-4-pentenyl2,2,2-trichloroethyl ester