Substituent types for atoms.
|kCDAtomRestrictNone||0||Default. Search is determined by the target database. Some databases (including ISIS) find compounds with any substitution at this atom and some databases (including DARC) find only compounds with substitution exactly as drawn.|
|kCDAtomRestrictFreeSites||1||Finds compounds in which the selected atoms may contain a range of substituents up to the number specified plus the number of bonds as drawn. A value of zero finds a substituent count as drawn.|
|kCDAtomRestrictSubstituentsUpTo||2||Finds compounds in which the selected atoms may contain a range of substituents up to the number specified.|
|kCDAtomRestrictSubstituentsExactly||3||Finds compounds in which the selected atoms contain the exact number of substituents as specified, up to 15 substituents.|