[1,2,4]Triazolo[4,3-b]pyridazin-6-amine

[1,2,4]Triazolo[4,3-b]pyridazin-6-amine is assigned CAS 19195-46-1 and formula C5H5N5. The unique PubChem match is CID 12272419, represented by SMILES C1=CC2=NN=CN2N=C1N. InChIKey LWSNTUJMYIJVMO-UHFFFAOYSA-N indexes the same atom graph. These references are especially important for a compact fused heterocycle whose bracketed name contains several independent numbering elements.

The prefix [1,2,4] identifies the nitrogen arrangement in the triazole portion, and [4,3-b] defines how that ring is fused to pyridazine. The 6-amine suffix locates the exocyclic amino substituent. Formula C5H5N5 records the nitrogen-rich composition across the fused core and amino group. Its compact five-carbon skeleton is differentiated mainly by nitrogen placement and fusion topology. Removing a bracket, reversing fusion numbers, or dropping the amine locant could point to another constitutional structure, although the resulting text might still resemble the verified name.

An exact review should compare the full bracket sequence with PubChem CID 12272419 rather than search only for triazolopyridazinamine. CAS 19195-46-1, the SMILES, and LWSNTUJMYIJVMO-UHFFFAOYSA-N add independent checks. When contacting Rlavie, provide the entire fused-ring name, requested quantity, and a structure file if one controls the project. That combination gives the reviewer both human-readable fusion notation and a machine-readable connection table for the specific 6-amino compound.