เฮกเซน

1.http://www.chemtrack.org/News-Detail.asp?TID=1&ID=92
2.http://images.cdri.multiply.multiplycontent.com/attachment/0/SR7GygoKCkQAAD7YG@E1/%E0%B9%80%E0%B8%AE%E0%B8%81%E0%B9%80%E0%B8%8B%E0%B8%99.doc?nmid=119955435