| phenyl-phosphonic aci cyclic methylene-o-phenylene ester |
| 3,2-benzodioxaphosphorin, 2-phenyl-4h- 2-oxide |
| k 1 |
| phenylphosphonic acid cyclic methylene-o-phenylene ester |
| phenyl-phosphonic aci cyclic ester with o-hydroxybenzyl alcohol |
| phenyl-phosphonic aci cyclic methylene-o-phenyleneester |
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