// typedef struct tagNormAtom
// {
// char elname[ATOM_EL_LEN]; /* chem. element name */
// U_CHAR el_number; /* number of the element in the Periodic Table */
// AT_NUMBR neighbor[MAXVAL]; /* positions (from 0) of the neighbors in the NORM_ATOM array */
// AT_NUMBR orig_at_number; /* original atom number, starts from 1 */
// AT_NUMBR orig_compt_at_numb; /* atom number within a component before terminal H removal */
// S_CHAR bond_stereo[MAXVAL]; /* 1=Up,4=Either,6=Down (this atom is at the pointing wedge)
// negative => on the opposite side of the wedge; 3=Either double bond */
// U_CHAR bond_type[MAXVAL]; /* 1=single, 2=double, 3=triple, 4=1/2 (bond order is 1 or 2) */
// /* 5=1/2/3, 6=1/3, 7=2/3, 8=tautomeric, 9=1/2 non-stereogenic */
// S_CHAR valence; /* number of bonds = number of neighbors not greater than MAXVAL */
// S_CHAR chem_bonds_valence; /* sum of bond types (1,2,3); type 4 needs special treatment */
// S_CHAR num_H; /* number of adjacent implicit hydrogen atoms including D and T */
// S_CHAR num_iso_H[NUM_H_ISOTOPES];/* number of adjacent implicit 1H(protium), 2H(D), 3H(T) < 16 */
// S_CHAR iso_atw_diff; /* =0 => natural isotopic abundances */
// /* >0 => (isotopic mass) - (rounded average atomic mass) + 1 */
// /* <0 => (isotopic mass) - (rounded average atomic mass) */
// S_CHAR charge; /* charge */
// S_CHAR radical; /* RADICAL_SINGLET, RADICAL_DOUBLET, or RADICAL_TRIPLET */
// S_CHAR bAmbiguousStereo; /* flag of detected stereo ambiguity */
// S_CHAR cFlags; /* AT_FLAG_ISO_H_POINT: atom may have exchangeable isotopic H */
// AT_NUMBR at_type; /* ATT_NONE, ATT_ACIDIC, etc. See InChI normalization code */
// AT_NUMBR component; /* number of the structure component > 0 */
// AT_NUMBR endpoint; /* id of a tautomeric group */
// AT_NUMBR c_point; /* id of a positive charge group */
// double x; /* x coordinate */
// double y; /* y coordinate */
// double z; /* x coordinate */
// /*--------- 0D parities ----------*/
// S_CHAR bUsed0DParity; /* bit=1 => stereobond; bit=2 => stereocenter */
// /*----- tetrahedral stereo parity */
// S_CHAR p_parity; /* tetrahedral (sp3) cml parity */
// AT_NUMBR p_orig_at_num[MAX_NUM_STEREO_ATOM_NEIGH]; /* orig_at_number of each neighbor > 0; 0=> no neighbor */
// /*----- stereo bond (SB) parities */
// S_CHAR sb_ord[MAX_NUM_STEREO_BONDS]; /* neighbor[] index of another end of this SB, starts from 0 */
// S_CHAR sn_ord[MAX_NUM_STEREO_BONDS]; /* neighbor[] index of a bond that is not this SB; starts from 0;
// -1 means the neighbor is a removed explicit H */
// /* atoms on both ends of a stereobond have same parity => trans/T/E/2, diff. parities => cis/C/Z/1 */
// S_CHAR sb_parity[MAX_NUM_STEREO_BONDS]; /* parities of stereobonds (sp2) incident to this atom */
// AT_NUMBR sn_orig_at_num[MAX_NUM_STEREO_BONDS]; /* orig_at_number of sn_ord[] neighbor > 0 */
// #if ( FIND_RING_SYSTEMS == 1 )
// S_CHAR bCutVertex; /* is the atom a cut-vertex or not */
// AT_NUMBR nRingSystem; /* starts from 1; number of a ring system */
// AT_NUMBR nNumAtInRingSystem; /* number of atoms in a ring system to which this at belongs */
// AT_NUMBR nBlockSystem; /* ambiguous if the atom is a cut-vertex: better apply this to bonds */
// #if ( FIND_RINS_SYSTEMS_DISTANCES == 1 )
// AT_NUMBR nDistanceFromTerminal; /* not used */
// #endif
// #endif
// } NORM_ATOM;
