Hydroxymaleic acid

CAS Registry Number®

1115-67-9

CAS Name

Hydroxymaleic acid

Molecular Formula

C4H4O5

Molecular Mass

132.07

Cite this Page

Hydroxymaleic acid.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/detail?cas_rn=1115-67-9 (retrieved 2025-08-05) (CAS RN: 1115-67-9).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Melting Point (1)

    182-183 °C

Source(s)

Other Names and Identifiers

InChI

InChI=1S/C4H4O5/c5-2(4(8)9)1-3(6)7/h1,5H,(H,6,7)(H,8,9)/b2-1+

InChIKey

InChIKey=UWYVPFMHMJIBHE-OWOJBTEDSA-N

SMILES

C(=C\C(O)=O)(\C(O)=O)/O

Canonical SMILES

O=C(O)C=C(O)C(=O)O

Other Names for this Substance

  • 2-Butenedioic acid, 2-hydroxy-, (2E)-
  • Maleic acid, hydroxy-
  • 2-Butenedioic acid, 2-hydroxy-, (E)-
  • (2E)-2-Hydroxy-2-butenedioic acid
  • Hydroxymaleic acid

CAS INSIGHTSTM
This is the vasculature of an actual heart (porcine heart, identical to human heart).