Apart from the fragment A, the remaining carbon signals were
essentially identical with those of demethylsalvicanol,15 an icetexane
diterpenoid which had been obtained in the wild Perovskia
atriplicifolia collected from Tibet,2 demonstrating compound 2 should include an demethylsalvicanol analogue moiety (Fragment B, Fig. 2). The only difference between Fragment B and demethylsalvicanol15 were chemical shifts of C-110 and C-120 as indicated in the 13C NMR spectrum (Table 2), implying the demethylsalvicanol moiety (Fragment B, Fig. 2) might be linked with fragment A through C-110 and C-120ิ The existence of fragment B was also