only S-enantiomer only .R-enantiomer racemic MIXTURE of both R- and S-enantiomers none of these.
Solution :Ibuprofen TABLETS contain both the R - and S - enantiomers, although only the S - enantiomer is effective. The R - enantiomer has no ANTI - inflammatory action but is slowly converted into S - enantiomer in the body.