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I read a medicinal chemistry book about SGLT2 inhibitors. One of them is tofogliflozin. In that book, they refer to it as spiroketal. Is the spiroketal functional group the red part in this picture? What is special about this group (to deserve a unique name)?

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    $\begingroup$ yes the red part is a spiroketal $\endgroup$
    – Waylander
    Aug 25, 2021 at 8:00
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    $\begingroup$ So, what would you like to know about it? Yes or no questions are not OK here. I guess what a spiro (not spiral!) compound is, for starters? $\endgroup$
    – Mithoron
    Aug 26, 2021 at 22:18
  • $\begingroup$ This ain't a name. "Spiro" is for two cycles connected in such fashion, and "ketal" is for ketal. $\endgroup$
    – Ivan Neretin
    Aug 29, 2021 at 19:38

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Quoting the entry on spiroketal from ChEBI:

A cyclic ketal in which the ketal carbon is the only common atom of two rings.

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