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We report a case of pancytopenia in a 23-year-old man with Crohn's disease who was treated with 5-aminosalicylic acid (Pentasa; Nisshin, Tokyo, Japan) 3.0 g/day.
 ( adverse event: treated with ,  a 23-year-old man with Crohn's disease: Subject, 23-year-old: Subject.Age, man: Subject.Gender, pancytopenia: Effect, 5-aminosalicylic acid (Pentasa; Nisshin, Tokyo, Japan) 3.0 g/day: Treatment, Crohn's disease: Treatment.Disorder, 5-aminosalicylic acid: Treatment.Drug, Pentasa: Treatment.Drug, 3.0 g/day: Treatment.Dosage) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: treated with ,  a 23-year-old man with Crohn's disease: Subject, 23-year-old: Subject.Age, man: Subject.Gender, pancytopenia: Effect, 5-aminosalicylic acid (Pentasa; Nisshin, Tokyo, Japan) 3.0 g/day: Treatment, Crohn's disease: Treatment.Disorder, 5-aminosalicylic acid: Treatment.Drug, Pentasa: Treatment.Drug, 3.0 g/day: Treatment.Dosage) 