The ability of bacteria to resist the effects of antibiotics, making infections difficult to treat.
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(6R-trans)-3-(chloromethyl)-7-[[[(2,6-dichloro-4-pyridinyl)thio]acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0.]oct-2-ene-2-carboxylic acid, diphenylmethyl ester
