The Universal Natural Products Database (UNPD) was designed to be a comprehensive resource of natural products for virtual screening. UNPD comprises 229358 molecules in the current version and their identification information (chemical name, CAS registry number, molecular formula, molecular weight, international chemical identifier and simplified molecular input line entry specification) and molecular properties (AlogP, Number of Hydrogen Bond Acceptor, Number of Hydrogen Bond Donors, ). All 3D structures (sdf and mol2 format) were optimized in the MMFF94 force field and can be freely accessed

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