Compound: allantoin
SMILES: NC(=O)NC1NC(=O)NC1=O 
Molecular weight: 158.117
Number of H-bond donors: 4
Number of rings: 1
Number of rotatable bonds: 1
Polar surface area: 113.32
Minimum degree: 1
ESOL predicted log solubility (mol/L): 0.652
Measured log solubility (mol/L): -1.6