Iridoids fromViburnum cylindricum

Two new iridoids, methyl (+)-rel-(1R,3S,4R,5R,8R,9R)-1,3,4,5,8,9-hexahydro-8-hydroxy-3-methoxy-2H-1a,2-dioxacyclopent[cd]indene-4-carboxylate (1) and methyl (+)-rel-(1R,3S,4S,5R,8R,9R)-1,3,4,5,8,9-hexahydro-8-hydroxy-3-methoxy-2H-1a,2-dioxacyclopent[cd]indene-4-carboxylate (2), were isolated from Viburnum cylindricum along with 14 known compounds. Their structures were determined by spectroscopic analyses. This type of iridoids bearing a MeO group at C(3) was discovered for the first time.