6-sulfo-alpha-D-quinovose <=> 6-sulfo-beta-D-quinovose
6-sulfo-alpha-d-quinovose <=> 6-sulfo-beta-d-quinovose
6-sulfo-alpha-D-quinovose <=> 6-sulfo-beta-D-quinovose
6-sulfo-alpha-d-quinovose <=> 6-sulfo-beta-d-quinovose