(3S,10S,30S,12R,19R)-27-[(2-Aminoethoxy)azamethylene]-2-ethyl-30-hydroxy-3,17,19,28-tetramethyl-9,13,25-trioxaspiro[2H-3,4,5,6-tetrahydropyran-6,6'-tetracyclo[15.6.1.1<4,8