3766
Patients with 200 to 500 CD4 cells / mm3 who tolerated < or = 12 weeks of prior zidovudine therapy received SC - 48334 ( 1000 mg every 8 h ) and zidovudine ( 100 mg every 8 h ) or zidovudine and placebo .
 Chemical: zidovudine; Chemical: SC - 48334; Chemical: zidovudine; Chemical: zidovudine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: zidovudine; Chemical: SC - 48334; Chemical: zidovudine; Chemical: zidovudine