Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the sum of the [3 H]CFT with an N ÷ D less than 393.8 and a [3H] paroxetine of 1045 (45)?

### Inputs:
table_name: table, columns: ['[ 3 H]CFT', '[ 3 H]Nisoxetine', '[ 3 H]Paroxetine', 'N ÷ D', 'S ÷ D']

### Response:
SELECT SUM [ 3 H]CFT FROM table WHERE N ÷ D < 393.8 AND [ 3 H]Paroxetine = 1045 (45)