| Outcome Measures: |
Primary: RatioCmax (serum glucose), RatioCmax=Cmax,day1/ Cmax,day-1 Cmax,day-1: Maximum serum glucose after 75g sucrose loading on Day -1 Cmax,day1: Maximum serum glucose after 75g sucrose loading and single dose administration of study drug on Day 1, Treatment period 1 and 2, Day-1 and Day 1: 10 minutes, 25 minutes, 40 minutes, 55 minutes, 1 hour 10 minutes, 1 hour 40 minutes, 2 hours 10 minutes, 3 hours 10 minutes, 4 hours 10 minutes|RatioAUC(0-4) (serum glucose), RatioAUC(0-4)=AUC(0-4),day1/AUC(0-4),day-1 AUC (0-4),day1: AUC of serum glucose from time 0 to 4 hours on Day 1 AUC(0-4),day-1: AUC of serum glucose from time 0 to 4 hours on Day -1, Treatment period 1 and 2, Day-1 and Day 1: 10 minutes, 25 minutes, 40 minutes, 55 minutes, 1 hour 10 minutes, 1 hour 40 minutes, 2 hours 10 minutes, 3 hours 10 minutes, 4 hours 10 minutes|Cmax (plasma metformin), Cmax: Maximum observed drug concentration in measured matrix after single dose administration / maximum drug concentration in plasma after single dose administration, Treatment period 1 and 2: Pre-dose, 0.5 hour, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 15 hours, 24 hours|AUC (0-tlast) (plasma metformin), AUC (0-tlast): AUC from time 0 to the last data point \> LLOQ (lower limit of quantification), Treatment period 1 and 2: Pre-dose, 0.5 hour, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 15 hours, 24 hours|AUC (plasma metformin), AUC: Area under the concentration vs. time curve from zero to infinity after single (first) dose, Treatment period 1 and 2: Pre-dose, 0.5 hour, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 15 hours, 24 hours | Secondary: Frequency of TEAE (treatment-emergent adverse event）, Approximate 20 days
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