Synonyms: Phosphonicacid, methyl-, cyclic diester with pentaerythritol (7CI); Phosphonic acid,methyl-, cyclic neopentanetetrayl ester (8CI);3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide;3,9-Dimethyl-3,9-dioxa-2,4,8,10-tetraoxa-3,9-diphosphaspiro-5,5-undecane;Pentaerythritol bis(methanephosphonate); Pentaerythritolspirobis(methylphosphonate)