SQL & PL/SQL

I got missing keyword for this simple SQL as following:

select max(proc_seq)
from STAT_TABLE
where case_nmbr = 'D215238' and
pers_nmbr = '001' and
proc_seq <= '01 Dec, 2008' and
payee = 'P' and
date_id = 46752;

Any suggestion?

Thank you