instruction: when did patient 86786 have the minimum value of creatinine last until 11/2105?
response: SELECT labevents.charttime FROM labevents WHERE labevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 86786) AND labevents.itemid IN (SELECT d_labitems.itemid FROM d_labitems WHERE d_labitems.label = 'creatinine') AND STRFTIME('%y-%m', labevents.charttime) <= '2105-11' ORDER BY labevents.valuenum, labevents.charttime DESC LIMIT 1