| No. | Name | Catagory | CAS NO. | 
| 41 | (S)-1-Boc-(3-Hydroxymethyl)pyrrolidine | Peptide synthesis | 199174-24-8 | 
| 42 | (S)-2-Methylpyrrolidine | Peptide synthesis | 59335-84-1 | 
| 43 | tert-Butyl 3-(hydroxymethyl)pyrrolidine -1-carboxylate | Peptide synthesis | 114214-69-6 | 
| 44 | (1R,2S)-1-Phenyl-2-(pyrrolidin-1-yl)propan-1-ol | Peptide synthesis | 127641-25-2 | 
| 45 | (S)-3-Pyrrolidinol hydrochloride | Peptide synthesis | 122536-94-1 | 
| 46 | Valeraldehyde | 110-62-3 | |
| 47 | 2-Octanone | 111-13-7 | |
| 48 | Valeric acid | 109-52-4 | |
| 49 | Ethyl butyrate | 105-54-4 | |
| 50 | Cyclohexanecarboxylic acid | 98-89-5 |