Description: 987 organic compounds containing a bi, sb, as, or p atom or containing a metal atom of the 6th to 8th group of the periodic system / 987 organic compounds containing a bi, sb, as, or p atom or containing a metal atom of the 6th to 8th group of the periodic system/(30) phosphorus compounds (9/02; 9/06) (49) ring is devoid of a p or a metal atom and contains at least one hereto atom (o, s, n, se, or te) and may or may not contain c (9/547; 9/6524) (90) single n as only hetero atom in ring (9/553; 9/568) (103) five-membered ring containing a single n atom (9/572; 9/572g; 9/572k; 9/572k2; 9/572k4; 9/572r) (104) ring is condensed or bridged to a carbocyclic ring system (9/572v)
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