The complex-toothed flying squirrel (Trogopterus xanthipes) occurs in the southern Chinese provinces Hubei, Hunan, Guizhou, Sichuan, and Yunnan.

The conservation status of the complex-toothed flying squirrel is near threatened because the population is shrinking as a result of habitat loss and excessive hunting for food and traditional Chinese medicine.

[5] Flying squirrels are among the various other species who profit from the protection of their habitat and there is hope that their numbers will rise again due to this measure.

A large number of the former inhabitants of the protected area have been relocated, however local officials have been known to turn a blind eye on local farmers allowing their cattle to graze within the limits of the park, so in order to ensure effective conservation of nature, of all species populating the area, some rules will have to be enforced with more vigor in the future.

[4] Various diterpenoids, both known and unknown, have been evaluated for cytotoxicity against human tumor cell lines,[9] and so have various neolignans classed as trogopterins.