1 Title Two new sesquiterpenoids from culture broth of Psilocybe samuiensis Authors Pornpakakul, S., a * Suwancharoen, S., a Petsom, A., a Roengsumran, S., a Muangsin, N., a Chaichit, N., b Piapukiew, J., c Sihanonth, P., d Allen, J. W. e * Corresponding author. Tel.: +66-2-2187637, +66-81-5620555; fax: +66-2- 2187598; e-mail: psuracha@chula.ac.th. a Department of Chemistry, Faculty of Science, Chulalongkorn University, Thailand, Phyathai Road, Bangkok 10330 Thailand b Department of Physics, Faculty of Science and Technology, Thammasart University, Thailand, Pathumthani 12121 Thailand c Department of Botany, Faculty of Science, Chulalongkorn University, Thailand, Phyathai Road, Bangkok 10330 Thailand d Department of Microbiology, Faculty of Science, Chulalongkorn University, Thailand, Phyathai Road, Bangkok 10330 Thailand e P.O. Box 45164 Seattle, Washington 98105, U.S.A