Mike S. answered • 01/23/22
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That's the indication of the chirality on the benzylic carbon, since 4 substituents on that carbon are different, which imposes chirality on that carbon.
If you wanna learn more about chirality, please see this link:
https://www.chemistrysteps.com/how-to-determine-r-and-s-configuration/
Mike S.
If you wanna assign R or S to that carbon, the absolute configuration of the molecule has to be drawn out in order to assign priority to each substituent on the benzylic carbon.01/23/22