(5R-(5alpha,5abeta,8aalpha,9beta))-5-(5,5a,6,8,8a,9-hexahydro-9-hydroxy-6-oxofuro(3',4':6,7)naphtho(2,3-d)-1,3-dioxol-5-yl)-3-methoxy-3,5-cyclohexadiene-1,2-dione 109010-93-7