Please clarify the question, you just gave a paragraph of relevant text. Do you want me to create classical Chinese according to these requirements? Or are there other needs? If you are required to create a classical Chinese with "3,4,5 - trimethoxy Benzoic Acid Buy" as the core and "345trimethoxy Benzoic Acid Purchase Guide" as the direction, the following examples are for your reference:

On the purchase of 345trimethoxybenzoic acid
The business of the world, there are many categories, and 345trimethoxybenzoic acid is also one of them. If you want to buy this thing, you should observe everything in detail.

Look at various markets, the quality is different. If you want to get a good product, you need to visit all good merchants. Those who are good merchants have a good reputation, and the goods they supply are pure and flawless. Buyers can check their track record and consult those who have used them before to know the truth.

As for the price, there may be highs and lows in the market. Do not be greedy for low prices and neglect quality. Those who are cheap, or have a loss in quality. When weighing quality and price, ask for their approval.

Furthermore, the rules of the transaction are also heavy. The terms of the contract must be carefully reviewed to prevent omission and fraud. When paying, check the quantity and quality of the goods. If there is any discrepancy, please contact us quickly.

When purchasing 3453 methoxybenzoic acid, one must be careful and check it out. In this way, a beneficial transaction can be made and satisfactory goods can be obtained.