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特許 係属中 The terpenoids (/ˈtɜrpɨnɔɪd/ tur-pə-noyd), sometimes called isoprenoids, are a large and diverse class of naturally occurring organic chemicals similar to terpenes, derived from five-carbon isoprene units assembled and modified in thousands of ways. Most are multicyclic structures that differ from one another not only in functional groups but also in their basic carbon skeletons.