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The intermediate 1-bromo-3-chlorocyclobutane can also be prepared via a modified Hunsdiecker reaction from 3-chlorocyclobutanecarboxylic acid using mercuric oxide and bromine: [4] A synthetic approach to bicyclobutane derivatives involves ring closure of a suitably substituted 2-bromo-1-(chloromethyl)cyclopropane with magnesium in THF . [ 5 ]
n.o.s. = not otherwise specified meaning a collective entry to which substances, mixtures, solutions or articles may be assigned if a) they are not mentioned by name in 3.2 Dangerous Goods List AND b) they exhibit chemical, physical and/or dangerous properties corresponding to the Class, classification code, packing group and the name and description of the n.o.s. entry [4]
The numbers are sometimes omitted in unambiguous cases. For example, bicyclo[1.1.0]butane is typically called simply bicyclobutane. The heterocyclic molecule DABCO has a total of 8 atoms in its bridged structure, hence the root name octane. Here the two bridgehead atoms are nitrogen instead of carbon atoms.
Cyclobutanecarboxylic acid is an intermediate in organic synthesis. For example, it is a precursor to cyclobutylamine. For example, it is a precursor to cyclobutylamine. [ 3 ]
The Unique Ingredient Identifier (UNII) is an alphanumeric identifier linked to a substance's molecular structure or descriptive information and is generated by the Global Substance Registration System (GSRS) of the Food and Drug Administration (FDA).
A product code consisting of 3 digits and a package code consisting of 2 digits for a total NDC length of 10 or 11 digits (5-3-2 or 6-3-2). If a labeler code is 4 digits in length, it may be combined only with a product code consisting of 4 digits and a package code consisting of 2 digits for a total NDC length of 10 digits (4-4-2).
It is updated every five years and its latest 11th [2] version of the system groups products into 45 classes (classes 1-34 include goods and classes 35-45 embrace services), and allows users seeking to trademark a good or service to choose from these classes as appropriate. Since the system is recognized in numerous countries, this makes ...
Pharmaceutical codes are used in medical classification to uniquely identify medication. They may uniquely identify an active ingredient , drug system (including inactive ingredients and time-release agents) in general, or a specific pharmaceutical product from a specific manufacturer.