Table 3. Details of hydrogen bonds between loop bases and between loop base and quartet base.

Model	Donors	Acceptors	Occupied(%)	lifetime(ps)
anti_bsc0	N6@A19	O4@T6	98.3	322.5
	N3@T6	N1@A19	98.4	441.5
	N2@G8	O4′@A7	91.4a	101.0
hybrid_bsc0	N3@T13	N1@A24	99.2	1229.5
	N6@A24	O2@T13	99.0	659.8
	N3@T1	N1@A20	99.9	6989.5
	N6@A20	O4@T1	99.4	931.0
	N2@G4	O4@T6	79.2	96.0

Results under parm99 force field are given in Table S2.

^aThis hydrogen bond formed after 250 ns in the simulation, so just last 700 ns of the trajectory was used to count the hydrogen bond.