4-amino-N-(1-methyl-2-phenyl-1,2-dihydro-pyrazol-3-ylidene)-benzenesulfonamide is a complex organic compound with the molecular formula C16H16N4O2S. It is characterized by a benzene ring with a sulfonamide group attached to the 4-amino position, and a pyrazole moiety linked to the nitrogen atom through a methylene bridge. The pyrazole ring is further substituted with a methyl group and a phenyl group. 4-amino-N-(1-methyl-2-phenyl-1,2-dihydro-pyrazol-3-ylidene)-benzenesulfonamide is known for its potential applications in pharmaceuticals and as a chemical intermediate, particularly in the synthesis of various drugs and agrochemicals. Its structure provides a platform for further functionalization and modification, making it a versatile building block in organic synthesis.

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Basic information
1. Product Name: 4-amino-N-(1-methyl-2-phenyl-1,2-dihydro-pyrazol-3-ylidene)-benzenesulfonamide
2. Synonyms:
3. CAS NO:901-81-5
4. Molecular Formula:
5. Molecular Weight: 328.395
6. EINECS: N/A
7. Product Categories: N/A
Chemical Properties
1. Melting Point: N/A
2. Boiling Point: N/A
3. Flash Point: N/A
4. Appearance: N/A
5. Density: N/A
6. Refractive Index: N/A
7. Storage Temp.: N/A
8. Solubility: N/A
9. CAS DataBase Reference: 4-amino-N-(1-methyl-2-phenyl-1,2-dihydro-pyrazol-3-ylidene)-benzenesulfonamide(CAS DataBase Reference)
10. NIST Chemistry Reference: 4-amino-N-(1-methyl-2-phenyl-1,2-dihydro-pyrazol-3-ylidene)-benzenesulfonamide(901-81-5)
11. EPA Substance Registry System: 4-amino-N-(1-methyl-2-phenyl-1,2-dihydro-pyrazol-3-ylidene)-benzenesulfonamide(901-81-5)
Safety Data
1. Hazard Codes: N/A
2. Statements: N/A
3. Safety Statements: N/A
4. WGK Germany:
5. RTECS:
6. HazardClass: N/A
7. PackingGroup: N/A
8. Hazardous Substances Data: 901-81-5(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 901-81-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,0 and 1 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 901-81:
(5*9)+(4*0)+(3*1)+(2*8)+(1*1)=65
65 % 10 = 5
So 901-81-5 is a valid CAS Registry Number.

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