Phosphatase acting preferentially on D-myoinositol 1-phosphate (D-Ins 1-P). a myo-inositol phosphate + H2O = myo-inositol + phosphate Polyol metabolism; myo-inositol biosynthesis; myo-inositol from D-glucose 6-phosphate: step 2/2. Ubiquitous. Expressed in pistil and seed endosperm. Detected in globular to heart stage embryos. Belongs to the inositol monophosphatase superfamily.