3,9-Bromophenoxy-2,4,8,10-tetraoxa-3,9-diphos phaspiro(5.5)undec
3,9-Dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro [5,5] undecane
3-(1,6-)Diaminohexyl-diloweralkyl) Phosphonates
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