So, a chemical gland seems to be a real nice piece of ware until you read the following part of the rules:
"Each gland can only produce a single compound, chosen when purchased, and the selection cannot be changed. These compounds must be naturally occurring and not synthetic." p.112 Chrome Flesh
That seems to make this whole thing absolutely useless.
I want to discuss some options, that might work:
Core:
Pepper Punch: If you like to eat spicey and have an immunity this might work as a spit weapon, sadly it would probably be not as effective since you can't replicate the CS and the other chemicals that work in combination with oreocapsicum.
Deepweed: Not synthetic but awakened. By RAW this is actually working. As GM I'd allow it if the player himself is awakened
Novacoke: Cocaine is naturally occuring. This should work. Especially interesting as gradual release drug in combination with a nephritic screen.
Lockdown:
Accelerator doesn't state if it's synthetic, but as a vasodilator it could very well be a natural drug.
Chrome Flesh:
Betel: Definitively natural, but so not worth it...
Cereprax: Not defined, very dangerous to overdo, not recommended
EX/Galak: Awakened drug, natural, not recommended
G3: Natural, but a compound of different plant extracts, so: Maybe
Guts: Not defined, GM call
Hurlg: Sure, why not have a brewery in your belly...
K-10: Not defined, but most likely not a natural product...
Nightwatch: Yes, but seriously, there are cheaper ways to get nightvision
Red Mescaline: Maybe, GM call
Woad: Yes, might be worth it if you also have the narco gen-ware
Overdrive: Yes, but pretty scary side effects
Immortal Flower: Yes, awakened, will eat your essence if you use it continuously and kill you thanks to the damage you sustain from having bioware
Rock Lizard blood: Yes, might be interesting for continuous use