"an antiviral drug used to combat HIV infection"@en-us . . . . . . "DDC"@en-us . . . "dideoxycytosine"^^ . "ddC"@en-us . . "zalcitabine"@en-us . . "0.25"^^ . "dideoxycytosine"@en-us . . . "103190763"^^ . "0.125"^^ . "03190763-n"^^ .