1. Support molecular structure, chemical reactions, biological sequences, biopolymers
2. Support stereochemistry
3. Support Polymer Chemistry
4. Read and write Molfile, Rxnfile, SMILES, SMARTS, XML, SDF, ChemDraw, ISIS/Draw
5. Conversion name (IUPAC, CAS, common name, etc.) into the chemical structure

Button C，N，O，P，S，F，I，H Corresponding to the atom。L key corresponding to Cl, B corresponds to Br。
For example, draw-type structure R- and retrieval, the result will be the type R-, S- and racemic mixture type are displayed