The structures of six new arborane type triterpenoids, rubiarbonols A, B, C, D, E, and F, from Rubia plants were determined as 3β, 7β, 19α, 28-tetrahydroxyarbor-9(11)-ene, 3β, 7β, 19α-trihydroxyarbor-9(11)-ene, 2α-acetoxy-3β, 7β, 19α-trihydroxyarbor-9(11)-ene, 3β-acetoxy-2α, 7β, 19α-trihydroxyarbor-9(11)-ene, 2α, 3β, 7β, 19α-tetrahydroxyarbor-9(11)-ene, and 2α, 3β, 7β, 19α, 28-pentahydroxyarbor-9(11)-ene respectively by various spectroscopic methods.
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