A 60-year-old male underwent subtotal gastrectomy for gastric cancer. On postoperative day 3, he developed high fever, chills, cough with scant purulent sputum, and left lower chest pain. X-ray showed left lower lobe pneumonia with abscess formation. Sputum cultures repeatedly grew methicillin-resistant Staphylococcus aureus (MRSA). Which of the following antibiotic choices is inappropriate?