Isotanshinone I with IC50s of 1.13 μM and 0.432 μM for α-glucosidase and AGE, respectively. Isotanshinone I has inhibitory activity against α-glucosidase and formation of AGE,
Isotanshinone IIA, could non-competitively inhibit Protein Tyrosine Phosphatase 1B (PTP1B) activity with an IC50 0f 11.4 μM. is an abietane-type diterpene metabolite.