| 摘要 |
A wood preservative that comprises as an active ingredient a Piper methysticum, plant or a processed product thereof or a compound represented by Formula (I): wherein R1, R2, R3, R4 and R16 are same or different and each denotes a hydrogen atom, hydroxy or a C1-4 alkoxy, or R1 and R2 are taken together to form a group represented by -O-(CH2)n-O- wherein n is an integer of 1 to 3, R5 is a C1-4 alkoxy and X is -CH=CH-, -CH2-CH2- or epoxyethylene, and the bond: <custom-character file="US20030060504A1-20030327-P00900.TIF" wi="20" he="20" id="custom-character-00001"/>denotes a single bond or a double bond can prevent the attacking wood by an insect harmful to the wood and also prevents the appearance and the growth of a wood-rotting fungus or a wood- staining fungus while being highly safe to humans and animals without exerting no adverse effect on the environment.
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