Table 2. Integrated number of electrons (N _e) and real space R value (R _RS) of ibuprofen and sila-ibuprofen over interaction density grids, visualized in Fig. 5 ▸ .

	Ibuprofen		Sila-ibuprofen
Model	N e (e)	R RS (%)	N e (e)	R RS (%)
S	0.402	0.358	0.424	0.353
C	0.527	0.470	0.476	0.397
P	0.508	0.453	0.416	0.384