The molecule has not the sulfanilamide core so it cannot be Sulfadiazine or Sulfamethoxazole. Carbocysteine and Acetylcysteine are similar but carbocisteine as the name recalls has a carboxymethyl- moiety on the sulfur and acetylcysteine as the name recalls has an N-acetyl moiety on the amino group. Hence the molecule is Acetylcysteine, known and sold under the trade names Mucomyst® and Acetadote®.
The correct answer is B.
References.
https://pubchem.ncbi.nlm.nih.gov/compound/Acetylcysteine
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