FUB-AMB Powder , also known as AMB-FUBINACA or MMB-FUBINACA, is a synthetic cannabinoid identified by the chemical name methyl 2-(1-(4-fluorobenzyl)-1H-indazole-3-carboxamido)-3-methylbutanoate. Its CAS number is 1971007-92-7, molecular formula is C₂₁H₂₂FN₃O₃, and molecular weight is approximately 383.4 g/mol.