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                      異氰酸酯是R–N=C=O式的官能團。含有異氰酸酯基的有機化合物稱為異氰酸酯。具有兩個異氰酸酯基團的異氰酸酯被稱為二異氰酸酯。異硫氰酸酯是化學基團-N=C=S,用硫取代異氰酸酯基團形成的氧。

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