(S)-2-((S)-2,2-Diethyl-5-oxo-[1,3]dioxolan-4-yl)-4-oxo-5-triisopropylsilanyl-3,4-dihydro-2H-pyridine-1-carboxylic acid (1R,2S)-2-(1-methyl-1-phenyl-ethyl)-cyclohexyl ester