Browse reference spectra from the USGS Spectral Library Version 7 and other curated sources. Each spectrum includes interactive plots, metadata, and downloadable data.
Have an unknown spectrum? Match it against this entire library with HQI similarity scoring — no install, no data leaves your machine.
Identify My SampleLearn more about how spectral matching works, HQI scoring, and building a personal reference library on the Spectral Library Search page.
| Formula | Modality | Category | Source | ||
|---|---|---|---|---|---|
| Succinate_acylated_spermidine | C11H23N3O3 | Mass Spec | Natural product | MassBank | |
| Succinic acid | C4H6O4 | Mass Spec | Environmental | MassBank | |
| Succinic acid-[1,2,3,4-13C4] | C4H6O4 | Mass Spec | Chemical | MassBank | |
| Succinylcholine | [C14H30N2O4]2+ | Mass Spec | Chemical | MassBank | |
| Succinylsulfathiazole | C13H13N3O5S2 | Mass Spec | Chemical | MassBank | |
| Sucralose | C12H19Cl3O8 | Mass Spec | Chemical | MassBank | |
| Sucrose | C12H22O11 | Mass Spec | Natural product | MassBank | |
| Sudan I | C16H12N2O | Mass Spec | Environmental | MassBank | |
| Sudan III | C22H16N4O | Mass Spec | Environmental | MassBank | |
| Sudan IV | C24H20N4O | Mass Spec | Environmental | MassBank | |
| Sulbactam | C8H11NO5S | Mass Spec | Metabolite | MassBank | |
| Sulconazole | C18H15Cl3N2S | Mass Spec | Chemical | MassBank | |
| Sulcotrione | C14H13ClO5S | Mass Spec | Environmental | MassBank | |
| Sulfabenzamide | C13H12N2O3S | Mass Spec | Chemical | MassBank | |
| Sulfacetamide | C8H10N2O3S | Mass Spec | Chemical | MassBank | |
| Sulfachloropyridazine | C10H9ClN4O2S | Mass Spec | Chemical | MassBank | |
| Sulfachlorpyridazine | C10H9ClN4O2S | Mass Spec | Environmental | MassBank | |
| Sulfaclozine | C10H9ClN4O2S | Mass Spec | Environmental | MassBank | |
| Sulfadiazine | C10H10N4O2S | Mass Spec | Pharmaceutical | MassBank | |
| Sulfadimethoxine | C12H14N4O4S | Mass Spec | Chemical | MassBank | |
| Sulfadimidine | C12H14N4O2S | Mass Spec | Environmental | MassBank | |
| Sulfadoxine | C12H14N4O4S | Mass Spec | Chemical | MassBank | |
| Sulfaguanidine | C7H10N4O2S | Mass Spec | Chemical | MassBank | |
| Sulfallate | C8H14ClNS2 | Mass Spec | Environmental | MassBank | |
| Sulfamerazine | C11H12N4O2S | Mass Spec | Chemical | MassBank | |
| Sulfameter | C11H12N4O3S | Mass Spec | Chemical | MassBank | |
| Sulfamethazine | C12H14N4O2S | Mass Spec | Pharmaceutical | MassBank | |
| Sulfamethizole | C9H10N4O2S2 | Mass Spec | Chemical | MassBank | |
| Sulfamethoxazole | C10H11N3O3S | Mass Spec | Pharmaceutical | MassBank | |
| Sulfamethoxazole hydroxylamine | C10H11N3O4S | Mass Spec | Metabolite | MassBank | |
| Sulfamethoxypyridazine | C11H12N4O3S | Mass Spec | Chemical | MassBank | |
| Sulfamic acid | H3NO3S | Mass Spec | Chemical | MassBank | |
| Sulfamonomethoxine | C11H12N4O3S | Mass Spec | Chemical | MassBank | |
| Sulfamoxole | C11H13N3O3S | Mass Spec | Environmental | MassBank | |
| Sulfanilamide | C6H8N2O2S | Mass Spec | Environmental | MassBank | |
| Sulfanilate | C6H7NO3S | Mass Spec | Chemical | MassBank | |
| Sulfanilic acid | C6H7NO3S | Mass Spec | Environmental | MassBank | |
| Sulfaphenazole | C15H14N4O2S | Mass Spec | Chemical | MassBank | |
| Sulfapyridine | C11H11N3O2S | Mass Spec | Chemical | MassBank | |
| Sulfaquinoxaline | C14H12N4O2S | Mass Spec | Chemical | MassBank | |
| Sulfasalazine | C18H14N4O5S | Mass Spec | Chemical | MassBank | |
| Sulfathiazole | C9H9N3O2S2 | Mass Spec | Chemical | MassBank | |
| Sulfentrazon | C11H10Cl2F2N4O3S | Mass Spec | Environmental | MassBank | |
| Sulfentrazone | C11H10Cl2F2N4O3S | Mass Spec | Chemical | MassBank | |
| Sulfinpyrazone | C23H20N2O3S | Mass Spec | Chemical | MassBank | |
| Sulfisoxazole | C11H13N3O3S | Mass Spec | Chemical | MassBank | |
| Sulfluramid | C10H6F17NO2S | Mass Spec | Chemical | MassBank | |
| Sulfocholic acid | C24H40O8S | Mass Spec | Chemical | MassBank | |
| Sulfoisophthalic acid | C8H6O7S | Mass Spec | Chemical | MassBank | |
| Sulforhodamine B (excitation) | — | Fluorescence | Fluorescent dye | FPbase |