instruction: when was the last time that patient 022-199074 was prescribed a medication via the oral mucosa route in their current hospital visit?
response: SELECT medication.drugstarttime FROM medication WHERE medication.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '022-199074' AND patient.hospitaldischargetime IS NULL)) AND medication.routeadmin = 'oral mucosa' ORDER BY medication.drugstarttime DESC LIMIT 1