Assign the appropriate designation of configuration (R or S) to the stereocenter in each of the following enantiomers. (Hint: Regarding cyclic structures containing stereocenters, treat the ring as if it were two separate substituents that happen to be attached to each other at the far end of the molecule - look for the first point of difference, just as you would for acyclic structures.)

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H3C H H, OH CI H Br он он он (r) C он он H3C H 3C H CH3 NH2 OCH3 CH3O