Key building block for life discovered in planet-forming disk

While astronomers have found evidence for other more complex molecules in planet-forming disks around other stars, this latest discovery is the first time that rare isotopes of methanol have been detected.

The phys org article doesn't specify which isotopes.

Edit: It's carbon 13 and deuterium:

In addition to CH3OH, we detect 13CH3OH for the first time in a Class II disk, revealing a factor of three enhancement of 13C in the disk large organics. A tentative detection of CH2DOH is also reported, resulting in a D/H of 1%–2%, which is consistent with the expected deuterium enhancement from the low-temperature CH3OH formation in molecular clouds and with the deuteration of CH3OH measured in comets.