A side-chain carbon creates two mirror-image forms
BOH-2C-B has a stereocentre at the carbon carrying its hydroxyl group. The structure shows four different attachments there: hydrogen, hydroxyl, an aromatic ring and an aminomethyl group. Their spatial arrangement allows two mirror-image forms, called enantiomers.
The word “fumarate” identifies a salt component; it does not specify which enantiomer is present. A name without an R or S designation leaves that question open. The two forms have the same molecular formula, so formula alone cannot reveal whether a sample contains one enantiomer or a mixture.





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