Heterocyclic Compounds, 4 or More Rings

Known as: 4-ring or more heterocyclic compounds, Heterocyclic Compounds with Four or More Rings, Heterocyclic Cpds, 4 or More Rings

A class of heterocyclic compounds that include four or more fused rings. Both aromatic or non-aromatic ring structures are included in this category.

National Institutes of Health

Papers overview

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2011

We extend the definition of a piecewise Noetherian ring to the noncommutative case, and investigate various properties of such…

2010

of A into its second dual. Following the terminology introduced by Bass [2] we shall say that A is torsionless if a is a…

2009

We investigate in this paper some equivalent conditions for right principally quasi-Baer rings to be reflexive. Using these…

2009

1. The correspondence theorem for projective modules 2. Structure of Noetherian simple rings 3. Noetherian simple domains 4…

2008

The CLIC pre-damping rings (PDR) have to accommodate a large emittance beam, coming in particular from the positron target and…

2005

Transformation of self-assembled InAs quantum dots (QDs) on InP(100) into quantum rings (QRs) is studied. In contrast to the…

2005

A new layered aluminophosphate, [C6N3H17][Al2(HPO4)(PO4)2] (denoted AlPO-CJ21), has been prepared in an alcoholic system by the…

2003

1997

This thesis is devoted to the description of the graph of links of some skew-polynomial rings and skew-Laurent rings; and the…

1975

Cytochemical studies were performed on erythrocytes containing Cabot rings from the peripheral blood of two patients with severe…