Indolocarbazole glycosides are balanced between two conformations: a "closed" conformation containing a cyclic hydrogen bond between the indolocarbazole NH and the pyranose oxygen and an "open" conformation in which the indolocarbazole NH is hydrogen bonded to solvent. The open conformation never has a commanding advantage, even in DMSO, but in nonpolar environments the cyclic conformation predominates.
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Gilbert et al. (1999) studied this question.
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