Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Stereoisomers are isomeric molecules that have the same molecular formula and sequence of bonded atoms (constitution), but which differ only in the three-dimensional orientations of their atoms in space. Structural isomers share the same molecular formula, but the bond connections and/or their order between different atoms/groups differs. In stereoisomers, the order and bond connections of the constituent atoms remains the same, but their orientation in space differs.