What is the molecular formula of the molecule 1-O-[2-[9-(1-hydroxy-2-methylpropan-2-yl)-2,4,8,10-tetraoxaspiro[5.5]undecan-3-yl]-2-methylpropyl] 2-O,3-O-bis(2,2,6,6-tetramethylpiperidin-4-yl) 5-oxopentane-1,2,3-tricarboxylate ?