Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) OKADA MASASHI and SAITO YUKIO,Sodium Borohydride Reduction of 15-Oxocardenolides,Chemical and Pharmaceutical Bulletin,0009-2363,The Pharmaceutical Society of Japan,1973,21,2,388-393,https://cir.nii.ac.jp/crid/1390282679148577664,https://doi.org/10.1248/cpb.21.388