as indicated on Japanese Wikipedia: no copyright restrictions do apply
The quality of this chemical structure is disputed.
The dispute is about: Poor overall quality — bonds are too thin, used font does not correspond to ACS style, excessive drug name below. Vector version of better quality is available (see below) (Please discuss the issue on this file's talkpage)
{{Information| |Description=Structure of Irinotecan molecule |Source=Copied from Japanese Wikipedia |Date=2006-05-02 |Author=Not identifiable (I do not understand Japanese at all, unfortunately) |Permission=as indicated on Japanese Wikipedia: no copyright