  Compact low emittance lattice cell providing large dynamic aperture is
essentual for development of extremely low (pm range) emittance storage rings.
As it is well known, a pair of identical sextupoles connected by a minus-identy
matrix transformer in ideal case of kick-like magnets provides infinite dynamic
aperture. Though the finite sextupole length degrades the aperture, it is still
large enough, and in this report we discuss development of the low emittance
lattice cell providing the -I condition for both horizontal and vertical
chromatic sextupoles. Such cell can be used as a module for lattices of
different emittance and length. As an example we develop a 3 GeV 10 pm
emittance storage ring and study its transverse dynamic aperture.
