R configuration for cysteine

I think my prof made a mistake. Shouldn't the answer be 1, 4 and 5 instead of 2 and 3?


[![enter image description here](https://i.stack.imgur.com/w0yvF.png)](https://i.stack.imgur.com/w0yvF.png)




If the programmers did not make a mistake it seems that you are right - ChemDraw is on your side.


$\hskip.5in$![Bildbeschreibung und so](https://i.stack.imgur.com/HHWKf.png)


 5