There are twenty-one (21)tetrahedral carbons in Vitamin D4 (structure shown). 
Definitions:
Economies Of Scale
The cost advantages that enterprises obtain due to their scale of operation, resulting in a decreased cost per unit of production.
Single-Firm
Refers to a market situation dominated by a single producer or service provider.
Network Externalities
Effects on a user of a product or service that depend on the number of other users of the same or compatible products or services.
Smartphone Market
The sector of the economy that deals with the production, sale, and distribution of smartphones and related services.
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