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Four new compounds ( 1 – 4 ) were isolated from the whole plants of two species of  Delphinium , including two C 20 -diterpenoid alkaloids, umbrodines A and B ( 1  and  2 ), and a dibenzoxazepinone, umbrolide A ( 3 ) from  Delphinium umbrosum  Hand.-Mazz. and a C 20 -diterpenoid alkaloid, kingiadine ( 4 ) from  Delphinium kingianum  Bruhl. ex Huth. Ten known diterpenoid alkaloids were also isolated. Their structures were elucidated  via  HR-ESIMS, IR, and NMR data. Lycoctonine ( 11 ) and delectinine ( 12 ) exhibited appreciable cardiac activity. Furthermore,  11  and  12  showed cardioprotective effects against doxorubicin-induced toxicity in H9c2 cells, with the maximum protection rates of 61.63% and 51.18%, respectively.

Diterpenoid alkaloids from two species of Delphinium