Hutchison China Meditech Ltd., of Hong Kong, also known as Chi-Med, said subsidiary Hutchison Whampoa Sinopharm Pharmaceuticals (Shanghai) Co. Ltd. entered an exclusive distribution agreement with Astrazeneca (Wuxi) Trading Co. Ltd., a unit of Astrazeneca plc, of London, to distribute and market antipsychotic drug Seroquel (quetiapine) in China. Seroquel, which is approved for the treatment of schizophrenia and bipolar disorder, was launched in China in 2001.