COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH

COOH – CH₂ - C (OH) (COOH) - CH₂ – COOH