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alkyl (methyl, ethyl, n-propyl eller isopropylphosphonyldifluorider, som f.eks.: df: methylphosphonyldifluorid (cas 676-99-3)
alkyl-(metyl, etyl, n-propoyl eller isopropyl) – fosfonyldifluorider, t.ex. df: metylfosfonyldifluorid (cas 676-99-3)