How to get the raw unit ?

How do I get the raw unit? I'd like to get the `M/L`. Instead, with `quants[0].unit.name` I get  `metre per litre`.

```
from quantulum3 import parser
quants = parser.parse('solubility is 2 M/L')
```

Also, is there a way to find the span of value and unit quantities seperately?