A 2-day-old preterm neonatal female (32 weeks gestation) with suspected ABO incompatibility and rising unconjugated hyperbilirubinemia is started on phototherapy. The serum bilirubin level is 16 mg/dL and continues to rise despite 18 hours of intensive phototherapy. Direct antiglobulin test (DAT/Coombs) is positive. What is the drug of choice to be administered immediately?

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