I've got to fill out a form for enrolment to Year 11 (it's a different campus to Year 7-10). I have to mention any allergies, but I can't remember how to spell it.
It's pronounced "cef-less spo-ren". I think it's used in some cough medicines or something, I can't remember.
Anyway, could anybody tell me how to spell it? Strange question, I know, but I need to know.