Synonym(s): CL-298741, YTR-830H Formula: C10H11N4NaO5S Formula weight: 322.27 CAS Number: 89785-84-2 Harmonized Tariff Code:  2941.90

An inhibitor of β-lactamases with greater activity against Ambler class A serine penicillinases and class C cephalosporinases, including TEM-1, SHV-1, and P99 (IC₅₀s = 97, 150, and 8.5 nM); also inhibits the class D oxacillinase OXA-2 (IC₅₀ = 10 nM).