2-[2-benzyloxymethyl-3-[8-benzyloxy-2-phenyl-7-(2,2,2-trichloro-ethoxycarbonylamino)-hexahydro-pyrano[3,2-d][1,3]dioxin-6-yloxy]-6-trichloroacetimidoyloxy-5-(2,2,2-trichloro-ethoxycarbonylamino)-tetrahydro-pyran-4-yloxy]-propionic acid ethyl ester