Hydrogen bond distance of isoquinolinones into the alternative site of yeast α-glucosidase.

Compound	Hydrogen bond distance (Å)
	Glu304	Other amino acid
(R)-10b	—	2.6 (His63)
(S)-10b	3.2	—
(R)-10e	2.2	2.1 (Asn241)
		2.7 (Arg312)
(S)-10e	—	2.3 (Arg222)
		2.7 (Trp242)
(R)-10o	—	2.5 (His239)
(S)-10o	3.3	3.1 (Thr307)