4-04-00-03508 (Beilstein Handbook Reference) 676-99-3 BRN 1739375 DF Difluoro Difluoromethylphosphine oxide Methyl difluorophosphite Methylphosphonic difluoride Methylphosphonyldifluoride Phosphonic difluoride, methyl- Phosphonodifluoridic acid, methyl-