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US 2022/0033355 A1Published application
Crystal form a of 2-(2, 5-dioxopyrrolidin-1yl) ethyl methyl fumarate, preparation method therefor and use thereof
OwnerGuobin REN, Dongxu YI +2inventors
InventorsGuobin REN, Dongxu YI, Weijie JI, Jiajun HUANG
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Abstract
A crystal form A of 2-(2, 5-dioxopyrrolidin-1yl)ethyl methyl fumarate has a good light irradiation stability, high-temperature stability and high-humidity stability.
Claims24
A crystal form A of 2-(2, 5-dioxopyrrolidin-1yl)ethyl methyl fumarate, wherein the X-ray powder diffraction thereof using Cu-Kα radiation has characteristic peaks at 2θ diffraction angles of 13.5±0.2°, 17.9±0.2°, 23.0±0.2° and 27.3±0.2°.
Dependencies are inferred from the claim text.