WHO naming stem · suffix · 5 listed names
-(o)pterin
pteridine derivatives
Where it sits in a name
WHO writes the stem as -(o)pterin. It has 2 spellings or places: opterin at the end of the name (…opterin); pterin at the end of the name (…pterin).
Of the 5 names WHO lists under it, 4 carry opterin at the end of the name, 1 carry pterin at the end of the name.
All 5 names WHO lists under -(o)pterin
These are the INN in group (a) of Part IV of the stem book: names in which WHO says the stem is used as defined. The stem is marked where WHO places it. A-Z as WHO lists them.
- aminopterin sodium
- fosdenopterin
- ronopterin
- sapropterin
- sepiapterin
Decode another name
Decoded
ronopterin
Listed INNCarries the WHO stem -(o)pterin
- -(o)pterinend of the nameWHO lists it hereWHO definition: pteridine derivatives
“ronopterin” is an INN that WHO lists under -(o)pterin in the 2024 stem book.
The same decoder as the front page: it reads the letters of a name against all 482 WHO stems, in your browser.
Source and licence
The definition of -(o)pterin (Part II B) and the 5 names (Part IV, group (a)) are from Use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances, 2024 (World Health Organization, Stem book 2024 (ISBN 978-92-4-009938-8); covers proposed INN Lists 1-129). Checked .
Adapted from: Use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances, 2024. Geneva: World Health Organization; 2024. Licence: CC BY-NC-SA 3.0 IGO. This adaptation was not created by WHO; WHO is not responsible for its content or accuracy and does not endorse this site. The data file stems.json is shared under the same licence.