6-Bromo-[1,2,4]triazolo[4,3-b]pyridazine

6-Bromo-[1,2,4]triazolo[4,3-b]pyridazine is identified by CAS 115127-23-6, molecular formula C5H3BrN4, and PubChem CID 13998365. The associated molecular weight is 199.01. Its verified SMILES is C1=CC(=NN2C1=NN=C2)Br, and InChIKey PLKMDCDKXTVNBB-UHFFFAOYSA-N records the same fused nitrogen-rich ring system.

The name describes a [1,2,4]triazolo ring fused to a pyridazine ring. Four nitrogen atoms occur in the C5H3BrN4 formula, consistent with the sequence of N atoms in the SMILES. Bromine is attached at position 6 and appears as the terminal Br branch. The bracketed fusion notation is important because a differently fused triazolopyridazine would be a distinct molecular graph. The verified InChI retains the fused connectivity in a separate standardized representation.

Reference CAS 115127-23-6 and the full fused-ring name when preparing an inquiry for Rlavie, together with the requested quantity. A MOL or SDF structure file is appropriate if the fused-ring connectivity requires checking. PubChem CID 13998365, SMILES C1=CC(=NN2C1=NN=C2)Br, and InChIKey PLKMDCDKXTVNBB-UHFFFAOYSA-N provide exact points of comparison before request-specific information is considered. Retaining the [1,2,4]triazolo[4,3-b] fusion notation prevents a different fused-ring arrangement from being selected during identity review. The bromine-bearing position should be retained as position 6. This keeps the displayed name aligned with the measured formula and exact molecular graph without ambiguity for this record.