Indigo is a C++ based organic chemistry and cheminformatics software environment. Features Include:

* Molecule and reaction rendering including SVG support * Automatic layout for SMILES-represented molecules and reactions * Canonical (isomeric) SMILES computation * Exact matching, substructure matching, SMARTS matching * Matching of tautomers and resonance structures * Molecule fingerprinting, molecule similarity computation * Fast enumeration of SSSR rings, subtrees, and edge sugraphs * Molecular weight, molecular formula computation * R-Group deconvolution and scaffold detection * Computation of the exact maximum common substructure for an arbitrary amount of input structures * Combinatorial chemistry * Plugin support in the API

File formats Indigo support include MDL Mol, SDF, RDF, CML, SMILES and SMARTS.

This package contains the following utilities:

* indigo-depict: Molecule and reaction rendering utility * indigo-cano: Canonical SMILES generator * indigo-deco: R-Group deconvolution utility * chemdiff: Visual comparison of two SDF or SMILES files (needs the JAVA libraries)