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Main observation and conclusionrnAs part of our continuing efforts toward the discovery of the biologically active diterpenoids from medicinal plants,six new C-ring aromatized abietane diterpenoids,clerodenoids A—F (1-6),were isolated from Clerodendrum chinense.These C-ring aromatized compounds mainly belonged to the rearranged abietane skeletons of 17(15→16)-abeo-abietane (2-4) and 17(15→16),18(4→3)-diabeo-abietane (5 and 6).Their structures were elucidated by extensive spectroscopic data,X-ray crystallography,and ECD calculation.Compounds 5 and 6 displayed strong antiprotiferative activities against A549 and HL-60 cell lines.