3. Parts : Aromatic and others Carbon Aromatic, Nitrogen Aromatic, Oxygen Aromatic, Stopper for Double bond, and Double bond unit for Benzene. Aromatic part has 3 bonds each extending to three directions on a plane. One of them is Horn-shaped ,working as male ( + ) for connection,and other two works as female ( - ) using the holes. Female bonds can be turned into male by inserting Connector Bio-25 to the holes. Benzene ring : Insert a male bond into female and connect 6 aromatic parts one to another. Then a benzene ring will be formed. Double bonding: When Carbon Aromatic are double bonded ,their rotation must be restricted. In this case , put Bio-25 Stopper for double bond (supplementary parts )between Carbon atoms connection, so that small protrusion on the bonds fit into the cut-out of the Stopper for double bond. Double bond unit for Benzene: Convenient part for Benzene is prepared by moulding two Carbon Aromatic to one part. Item No. Name Bond Length Bond Arrangement Color Angle Shape Bio-5 Carbon Aromatic 0.7 Black 120° Bio-6 Nitrogen Aromatic 0.7 Blue 120° Bio-7 Oxygen Aromatic 0.7 Red 120° Item No. Name Bond Length Bond Arrangement Color Angle Shape Bio- Locking Double bond Grey Bio- Double bond unit for Benzene 0.7 1.4 Blue 120° Example for assembly Fig.3 Fig.4 HGS Molecular Structure Model HGS HINOMOTO PLASTICS CO., LTD. 1-10-24, Meguro-Honcho, Meguro-ku, Tokyo, Japan PHONE: +81-3-3714-7226 FAX: +81-3-3714-4657 E-MAIL(technical support): hgs@po.sphere.ne.jp E-MAIL(order support): t_kaneko@maruzen.co.jp