t-butyl 4-(2'-chloroethyl)-3,5-dimethylpyrrole-2-carboxylate

tert-butyl 1-(1-methyl-1H-pyrazol-4-yl)-4-oxo-1,4-dihydropyrazine-3-carboxylate

tert-butyl 2-benzylacetoacetate

E isomer of t-butyl α-(tetrahydro-2-furylidene)acetate

t-butyl (3S*,5R*,6E)-7-phenyl-3,5-isopropylidenedioxy-6-heptenoate