the ability to control which of multiple possible regioisomers is formed in a reaction
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Bicyclo[2.2.1]hept-2-ene, 7-(diphenylmethylene)-5-methylene-6-(phenylsulfonyl)-, endo-
Furan, 3-bromo-5-(4-methoxyphenyl)-4-methyl-2-phenyl-
