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Ring A is a hemiacetal in the$\mathrm{\beta }$-configuration, ring B is an acetal in the$\mathrm{\alpha }$-configuration

Ring A is a hemiacetal in the$\mathrm{\alpha }$-configuration, ring B is an acetal in the$\mathrm{\beta }$-configuration

Ring A is an acetal in the$\mathrm{\beta }$-configuration, ring B is a hemiacetal in the$\mathrm{\alpha }$-configuration

Ring A is an acetal in the$\mathrm{\alpha }$-configuration, ring B is a hemiacetal in the$\mathrm{\beta }$-configuration