Effect of Yunnan herb Laggera pterodonta against influenza A(H1N1)virus in vitro FOUR NEW SESQUITERPENOIDS FROM LAGGERA PTERODONTA FIVE NEW EUDESMANE DERIVATIVES FROM LAGGERA PTERODONTA Chemical Composition and Antimicrobial Activities of Essential Oils of Laggera pterodonta Collected in Four Different Locations in Yunnan, China* THREE NEW SESPUITERPENOLS FROM LAGGERA PTERODONTA Chemical constituents of Laggera pterodonta