Three terpenoids Germacrene, Patchoulol or patchouli alcohol, Norpatchoulenol found in patchouli oil are responsible for the typical patchouli scent. TLC and HPLC were used to identify the possible chemical markers for evaluating the quality of the crude drug "Pogostemoni herba" (aerial part of P. cablin), a component of Kampo medicines. In addition to the reported patchouli alcohol and 2-hydroxy-6-methyl-3-(4-methylpentanoyl)-4-pyrone, three phenylethanoids (acteoside, isoacteoside, and crenatoside) were isolated from this plant material for the first time.