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IR (film, cm\u22121): 3463 (\u03c5OH), 3028 (\u03c5=C-H), 2931(\u03c5=C-H), 1727 (\u03c5CO). HRMS (ESI-TOF+):\u00a0m\/z: calc for [C26H32O4Na]+: 431.2192; [M+Na]+: found 431.2192."},{"key":"10.1016\/j.jsbmb.2022.106134_bib16","doi-asserted-by":"crossref","first-page":"403","DOI":"10.1016\/S0968-0896(00)00259-5","article-title":"Synthesis and evaluation of A-ring diastereomers of 1\u03b1,25-dihydroxy-22-oxavitamin D3 (OCT)","volume":"9","author":"Hatakeyamaa","year":"2001","journal-title":"Bioorg. Med. Chem."},{"key":"10.1016\/j.jsbmb.2022.106134_bib17","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/S0968-0896(99)00262-X","article-title":"Efficient synthesis and biological evaluation of all A-ring diastereomers of 1\u03b1,25-dihydroxyvitamin D3 and its 20-epimer","volume":"8","author":"Fujishima","year":"2000","journal-title":"Bioorg. Med. 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