Whenever you see a number after the root symbol, it means that you are looking at an adjusted option due to a corporate event. Adjusted options are a PITA.
I see OXY2 options listed in IBKR as well as at a web site that provides option quotes so I'm not sure what to say about your question about the contracts having stopped trading. Here is some information regarding that adjustment:
On June 26th, Occidental Petroleum announced a distribution of warrants to purchase additional shares of common stock. Owners of OXY shares will receive 1/8th of a warrant for each share of common. A warrant will entitle the holder to buy one share of OXY common for $22 per share. The waarrants will be distributed on 8/03/20 to stockholders of record as on 7/06/20. The warrants will have a term of 7 years and are expected to trade on the NYSE.
Here is the information from the OCC adjustment bulletin:
DATE: JULY 1, 2020
SUBJECT: OCCIDENTAL PETROLEUM CORPORATION – WARRANT DISTRIBUTION OPTION SYMBOLS: OXY/2OXY NEW SYMBOLS: OXY2/2OXY2 FUTURES SYMBOL: OXY1D NEW SYMBOL: OXY2D DATE: 7/2/20
Occidental Petroleum Corporation (OXY) has declared a warrants distribution to OXY Common Shareholders, as described below:
WARRANTS: Each warrant will provide the right to purchase one share of Occidental Petroleum Corporation (OXY) Common Stock
PRICE: $22.00 per OXY share
DISTRIBUTION RATIO: 0.125 of a warrant per one Occidental Petroleum Corporation (OXY) Common Share
RECORD DATE: July 6, 2020
EXPIRATION: To be determined
GUARANTY PERIOD: To be determined
Occidental Petroleum Corporation (OXY) Warrants are anticipated to trade on The New York Stock Exchange.
CONTRACT ADJUSTMENT – OPTIONS
EFFECTIVE DATE: July 2, 2020
OPTION SYMBOLS: OXY changes to OXY2 2OXY change to 2OXY2
STRIKE DIVISOR: 1
CONTRACT MULTIPLIER: 1
NEW MULTIPLIER: 100 (e.g., a premium of 1.50 yields $150)
NEW DELIVERABLE PER CONTRACT: 1) 100 Occidental Petroleum Corporation (OXY) Common Shares 2) 12 Occidental Petroleum Corporation Warrants 3) Cash in lieu of 0.5 fractional OXY Warrants
SETTLEMENT ALLOCATION: OXY: 95% OXY Warrants: 5%
CUSIPS: OXY: 674599105 OXY Warrants: TBD
THE SETTLEMENT ALLOCATION OF THE TOTAL STRIKE PRICE AMOUNT IS BEING PROVIDED SOLELY FOR THE PURPOSE OF THE INTERFACE BETWEEN OCC AND THE NATIONAL SECURITY CLEARING CORPORATION (NSCC), AND IS NOT INTENDED TO BE USED FOR ANY OTHER PURPOSE, TRANSACTION OR CUSTOMER ACCOUNT STATEMENTS.
Until the cash in lieu amount is determined, the underlying price for OXY2 will be determined as follows:
OXY2 = OXY + 0.125 (OXY Warrants)
You might be able to get more clarification if you contact the CBOE.