Click the structures and reaction arrows in sequence to view the 3D models and animations respectively
Thiols are excellent at conjugate addition even if the unsaturated carbonyl is an aldehyde as in this case of an enal.
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Alternatively, use these links: (Substrate: Nucleophile)
Unsat. nitrile : Amine | Unsat. ester : Amine | Imine : Enamine | Unsat. aldehyde : Thiol
A. G. Csákÿ, G. de la Herrán and M. C. Murcia, Chem. Soc. Rev., 2010, 39, 4080.