The study of a molecule's three-dimensional structure is known as stereochemistry. The sole structural difference between the cis and trans isomers, which are types of stereoisomers, is where the atoms of the molecule are situated in three dimensions.
Stereochemistry is a branch of chemistry that studies and manipulates the relative spatial arrangement of atoms within molecules.
Because a drug's shape affects how it interacts with the different biological molecules (enzymes, receptors, etc.) that it comes into contact with in the body, stereochemistry is crucial to understanding how drugs work.
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