* Acetonyl group
* Acyl group (e.g. acetyl group, benzoyl group) 
* Alkyl group (e.g., methyl group, ethyl group) 
* Alkenyl group (e.g., vinyl group, allyl group) 
* Alkynyl group (propargyl group)
* Benzyloxycarbonyl group (Cbz)
* tert-butoxycarbonyl group (Boc) 
* Carboxyl group