Orange 3420 book?

I can’t tell what you mean by “Orange 3420 book” from the information provided.

A few common possibilities:
- A specific book title that includes “Orange” and “3420” (maybe a series number, year, or edition).
- A medical or pharmaceutical reference (e.g., a formulary, prescribing guide, or “Orange Book” listing—though “3420” isn’t enough to identify a specific entry).
- A library/catalog identifier (ISBN, call number, or internal record).

Tell me one more detail and I’ll give you the right answer:
1) What is the full title or author (if you know it)?
2) Where did you see “Orange 3420 book” (Amazon, a syllabus, a hospital/pharmacy site, Google Books, etc.)?
3) What country or language is it associated with?

If you meant the U.S. FDA “Orange Book,” say so and share what “3420” refers to (drug name, application number, or manufacturer) and I’ll look up the relevant record.