Maleic acid (cis ethylene dicarboxylic acid (CH. COOH)2) crystals were prepared from acetone in a new habit, platy on (001). The structure is monoclinic, a----7.47, b=10-15, c----7.65 A, fl=123.5 , Q--1.599 g.cm.-a; P21/c, 4 asymmetric molecules per unit cell.
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M. El- Shahat (1952) studied this question.