/**
 * @fileoverview Minimal parser for the V2000 SDF connection table (atom + bond blocks).
 * PubChem emits V2000 for 3D conformer records; the format is fixed-column and has been
 * stable since 1991, so a focused slice-based parser is more robust than a dependency.
 * @module services/pubchem/sdf-parser
 */
import type { Sdf3DStructure } from './types.js';
/**
 * Parse the first molecule's atom and bond blocks from a V2000 SDF record.
 *
 * Layout: three header lines, then a counts line (atom count at columns 0–3, bond count at
 * columns 3–6), then one fixed-column line per atom (x/y/z as `F10.4` at columns 0–10/10–20/
 * 20–30, element symbol at columns 31–34), then one line per bond (atom1/atom2/order as
 * three-column integers). The block is terminated by `M  END`.
 *
 * Throws when the counts line is missing or unparseable — a malformed record is a hard
 * failure, not a silently-empty success.
 */
export declare function parseSdfV2000(sdf: string): Sdf3DStructure;
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