9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-methanol 10-oxide (CAS No.35948-26-6), its synonyms are (6-Oxido-6H-dibenzo[c,e][1,2]oxaphosphinin-6-yl)methanol ; 6H-Dibenz(c,e)(1,2)oxaphosphorin-6-methanol 6-oxide .