Explanatory notes
… otherwise requires, the headings of this Chapter apply only to : (a) Separate chemically defined organic … which, apart from hydrogen, oxygen and nitrogen, only have directly linked to carbon the atoms of sulphur or … or imides of polybasic acids. These provisions apply only when the ring-position hetero-atoms are those resulting …Legal note
… otherwise requires, the headings of this Chapter apply only to : (a) Separate chemically defined organic … which, apart from hydrogen, oxygen and nitrogen, only have directly linked to carbon the atoms of sulphur or … or imides of polybasic acids. These provisions apply only when the ring-position hetero-atoms are those resulting …