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Sildenafil citrate

Side chain for meropenem

N-Succinimidyl 4-(4-maleimidophenyl)butyrate

Side chain for imipenem

N-Succinimidyl 4-(N-maleimidomethyl)cyclohexane-1-carboxylate

Sibutramine hydrochloride

N-Succinimidyl 6-maleimidohexanoate

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