3,5-di-tert-butyldimethylsilyloxy-4-methoxybenzaldehyde

(7S,11R)-5-hydroxy-4-methyl-6,7,10,11-tetrahydro-8H-7,11-epimino[1,3]dioxolo[4',5':5,6]benzo[1,2-d]oxocin-8-one