Available Polyamine standards
| Name | Precursor Formula | HMDB | KEGG |
| Putrescine* | C4H12N2 | HMDB0001414 | C00134 |
| Acetylputrescine | C6H14N2O | HMDB0002064 | C02714 |
| Spermine | C10H26N4 | HMDB0001256 | C00750 |
| Spermidine* | C7H19N3 | HMDB0001257 | C00315 |
*) available as stable heavy isotope labeled standard.