p. 355 - 358
(2014)p. 22737 - 22748
(2016/03/26)methanol
diisopropyl 3-(((tert-butoxycarbonyl)amino)methyl)cyclobutane-1,1-dicarboxylate
(3,3-bis(isopropoxycarbonyl)cyclobutyl)acetic acid
diisopropyl 3-((hydrazinecarbonyl)methyl)cyclobutane-1,1-dicarboxylate
diisopropyl 3-((methoxycarbonyl)methyl)cyclobutane-1,1-dicarboxylate