(3S,10S,30S,12R,19R)-2-ethyl-30-Hydroxy-27-(hydroxyimino)-17-(hydroxymethyl)-3,19,28-trimethyl-9,13,25-trioxaspiro[2H-3,4,5,6-tetrahydropyran-6,6'-tetracyclo[15.6.1.1<4,8