Module chapter_map 

Maps detected functional groups to HS chapter / heading hints.

The mapping is intentionally approximate; predictions from this module carry confidence ≤ 0.70 and are tagged with PredictionSource::RuleEngine.

Priority order

More specific functional groups take precedence (e.g. anhydride > carboxylic acid > alcohol). The first matching rule wins.

HS structure used

• Chapter 28 — inorganic chemicals (when organic_class is Inorganic)
• Chapter 29 — organic chemicals (sub-headings by functional group)
• Chapter 38 — misc. chemical preparations (default organic fallback)

Structs

HeadingHint

HS chapter / heading hint derived from SMILES functional group analysis.

Functions

map_to_heading

Derive an HS chapter / heading hint from functional group analysis.