Compound

R

Initial aldose

Form in crystals

Tautomeric composition (%) in DMSOd₆

Form B

Form A

Form C

1a

H

L-Arabinose

C

-

40

60

1b

CH₃

L-Rhamnose

C

-

30

70

1c

CH₂OH

D-Galactose

C

-

35

65

1d

CH₂OH

D-Glucose

C

10

45

45

1e

CH₂OH

D-Mannose

C

-

20

80