Question: What is the polar surface area (PSA) value of this compound?
 The Chemical has the SMILES O=[N+]([O-])OC[C@H]1O[C@@H](n2cnc3c(NC4CCCC4)ncnc32)[C@H](O)[C@@H]1O.
Answer: 157.69
{#Question|Q!}: {quest#}
{#Constraint:|Description:|!} The {#Molecule|Compound|Chemical!} {#has the|can be represented with the!} {SMILES__description} {SMILES#}.
{#Answer|Result|Answer!}: {answ#}
O=[N+]([O-])OC[C@H]1O[C@@H](n2cnc3c(NC4CCCC4)ncnc32)[C@H](O)[C@@H]1O
O=[N+]([O-])OC[C@H]1O[C@@H](n2cnc3c(NC4CCCC4)ncnc32)[C@H](O)[C@@H]1O
[(2R,3S,4R,5R)-5-[6-(cyclopentylamino)purin-9-yl]-3,4-dihydroxyoxolan-2-yl]methyl nitrate
What is the polar surface area (PSA) value of this compound?