Isolation, Structural Elucidation, and Cytotoxicity of Three New ent-Kaurane Diterpenoids from Isodon japonica var. glaucocalyx

Erratum for: Isolation, Structural Elucidation, and Cytotoxicity of Three New ent-Kaurane Diterpenoids from Isodon japonica var. glaucocalyx

Published in Planta Medica 2012; 78 (6): 589–596

The structure of natural compound 1 isolated from Isodon japonica var. glaucocalyx, glaucocalyxin H, was assigned incorrectly and should be assigned as following [Fig. 1].

Fig. 1 Structural correction of compound 1.

In our published paper, the position of two hydroxyl groups in aromatic ring was elucidated as 3',5'-dihydroxy substitution by 1D and 2D NMR experiment. Recently, in our research project for the structural modification of the parent compound of 1, glaucocalyxin A, we synthesized the compound 1 from glaucocalyxin A and 3,4-dihydroxybenzaldehyde (i.e. protocatechualdehyde). The result confirmed that the two hydroxyl groups of 1 should be located in C-3', C-4'.

Our Supporting Information was corrected accordingly.