instruction: when was the first time that patient 030-42006 was prescribed with omeprazole (prilosec) cap 20 mg in their current hospital encounter?
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 = '030-42006' AND patient.hospitaldischargetime IS NULL)) AND medication.drugname = 'omeprazole (prilosec) cap 20 mg' ORDER BY medication.drugstarttime LIMIT 1