MassBank, https://massbank.eu/
License: CC BY 4.0
Have an unknown? Upload it and match against 1-(4,6-DIMETHOXY-1,2-DIHYDRO-1,3,5-TRIAZINE-2-YLIDENE)-2-(4,6 -DIMETHOXY-1,3,5-TRIAZINE-2-YL)-CYCLOPENTA-2,4-DIENE and thousands more references with HQI scoring.