p. 7139 - 7144
(2007/10/03)cis-2-methylcyclobutanecarboxylic acid
(+/-)-cis-1-carbomethoxy-2-bromomethyl-cyclobutane
(+/-)-cis-1-carbomethoxy-2-methylcyclobutane
(+/-)-cis-3-oxabicyclo<3.2.0>heptan-2-one
diethyl 2-methylcyclobutane-1,1-dicarboxylate